diff --git a/app/controllers/collections_controller.rb b/app/controllers/collections_controller.rb
index f5eb8c9fc..aaf71e046 100644
--- a/app/controllers/collections_controller.rb
+++ b/app/controllers/collections_controller.rb
@@ -33,7 +33,7 @@ class CollectionsController < ApplicationController
     end
 
     def collection_params
-      params.expect(collection: [ :name, :all_access, :auto_close_period ])
+      params.expect(collection: [ :name, :all_access, :auto_close_period, :auto_reconsider_period ])
     end
 
     def grantees
diff --git a/app/models/account.rb b/app/models/account.rb
index f562ef665..b2a4d71b5 100644
--- a/app/models/account.rb
+++ b/app/models/account.rb
@@ -1,5 +1,5 @@
 class Account < ApplicationRecord
-  include Joinable
+  include Entropy, Joinable
 
   has_many_attached :uploads
 end
diff --git a/app/models/account/entropy.rb b/app/models/account/entropy.rb
new file mode 100644
index 000000000..39c47f2b5
--- /dev/null
+++ b/app/models/account/entropy.rb
@@ -0,0 +1,18 @@
+module Account::Entropy
+  extend ActiveSupport::Concern
+
+  included do
+    has_one :default_entropy_configuration, class_name: "Entropy::Configuration", as: :container, dependent: :destroy
+
+    before_save :set_default_entropy_configuration
+  end
+
+  private
+    DEFAULT_ENTROPY_PERIOD = 30.days
+
+    def set_default_entropy_configuration
+      self.default_entropy_configuration ||= build_default_entropy_configuration \
+        auto_close_period: DEFAULT_ENTROPY_PERIOD,
+        auto_reconsider_period: DEFAULT_ENTROPY_PERIOD
+    end
+end
diff --git a/app/models/card/entropy.rb b/app/models/card/entropy.rb
index 0b6f6e4aa..d5dd17268 100644
--- a/app/models/card/entropy.rb
+++ b/app/models/card/entropy.rb
@@ -8,9 +8,9 @@ module Card::Entropy
     scope :in_auto_closing_collection, -> { joins(:collection).merge(Collection.auto_closing) }
 
     scope :stagnated,        -> { doing.where(last_active_at: ..AUTO_RECONSIDER_PERIOD.ago) }
-    scope :due_to_be_closed, -> { considering.in_auto_closing_collection.where("last_active_at <= DATETIME('now', '-' || auto_close_period || ' seconds')") }
+    scope :due_to_be_closed, -> { considering.in_auto_closing_collection.where("last_active_at <= DATETIME('now', '-' || entropy_configurations.auto_close_period || ' seconds')") }
 
-    delegate :auto_close_period, to: :collection
+    delegate :auto_close_period, :auto_reconsider_period, to: :collection
   end
 
   class_methods do
diff --git a/app/models/collection.rb b/app/models/collection.rb
index 9b74d8524..0fc1e912e 100644
--- a/app/models/collection.rb
+++ b/app/models/collection.rb
@@ -1,11 +1,12 @@
 class Collection < ApplicationRecord
-  include AutoClosing, Accessible, Broadcastable, Filterable, Workflowing
+  include AutoClosing, Accessible, Broadcastable, Entropy, Filterable, Workflowing
 
   belongs_to :creator, class_name: "User", default: -> { Current.user }
 
   has_many :cards, dependent: :destroy
   has_many :tags, -> { distinct }, through: :cards
   has_many :events
+  has_one :entropy_configuration, class_name: "Entropy::Configuration", as: :container, dependent: :destroy
 
   scope :alphabetically, -> { order("lower(name)") }
 
diff --git a/app/models/collection/auto_closing.rb b/app/models/collection/auto_closing.rb
index e3a9c8990..c8e52cb12 100644
--- a/app/models/collection/auto_closing.rb
+++ b/app/models/collection/auto_closing.rb
@@ -2,12 +2,12 @@ module Collection::AutoClosing
   extend ActiveSupport::Concern
 
   included do
-    scope :auto_closing, -> { where.not(auto_close_period: nil) }
+    scope :auto_closing, -> { joins(:entropy_configuration).where.not("entropy_configurations.auto_close_period": nil) }
     before_create :set_default_auto_close_period
   end
 
   def auto_closing?
-    auto_close_period.present?
+    entropy_configuration.present?
   end
 
   private
diff --git a/app/models/collection/entropy.rb b/app/models/collection/entropy.rb
new file mode 100644
index 000000000..ddf0883f4
--- /dev/null
+++ b/app/models/collection/entropy.rb
@@ -0,0 +1,21 @@
+module Collection::Entropy
+  extend ActiveSupport::Concern
+
+  included do
+    delegate :auto_close_period, :auto_reconsider_period, to: :entropy_configuration
+  end
+
+  def entropy_configuration
+    super || Account.sole.default_entropy_configuration
+  end
+
+  def auto_close_period=(new_value)
+    entropy_configuration ||= association(:entropy_configuration).reader || self.build_entropy_configuration
+    entropy_configuration.update auto_close_period: new_value
+  end
+
+  def auto_reconsider_period=(new_value)
+    entropy_configuration ||= association(:entropy_configuration).reader || self.build_entropy_configuration
+    entropy_configuration.update auto_reconsider_period: new_value
+  end
+end
diff --git a/app/models/entropy.rb b/app/models/entropy.rb
new file mode 100644
index 000000000..42e730a09
--- /dev/null
+++ b/app/models/entropy.rb
@@ -0,0 +1,5 @@
+module Entropy
+  def self.table_name_prefix
+    "entropy_"
+  end
+end
diff --git a/app/models/entropy/configuration.rb b/app/models/entropy/configuration.rb
new file mode 100644
index 000000000..72370670f
--- /dev/null
+++ b/app/models/entropy/configuration.rb
@@ -0,0 +1,3 @@
+class Entropy::Configuration < ApplicationRecord
+  belongs_to :container, polymorphic: true
+end
diff --git a/app/views/collections/edit/_auto_close.html.erb b/app/views/collections/edit/_auto_close.html.erb
index 585627dd6..d4455e45b 100644
--- a/app/views/collections/edit/_auto_close.html.erb
+++ b/app/views/collections/edit/_auto_close.html.erb
@@ -5,12 +5,12 @@
       <strong>Cards in Considering</strong>
       <p class="txt-x-small margin-none">Auto-close after…</p>
       <%= form_with model: collection, data: { controller: "form" } do |form| %>
-        <%= form.select :auto_close_period, collection_auto_close_options, {}, { class: "input input--select full-width margin-block-half txt-small fill-white txt-align-center", data: { action: "change->form#submit" } } %>
+        <%= form.select :auto_reconsider_period, collection_auto_close_options, {}, { class: "input input--select full-width margin-block-half txt-small fill-white txt-align-center", data: { action: "change->form#submit" } } %>
       <% end %>
     </div>
     <div class="separator margin-block-half" style="--border-color: var(--color-ink-medium); min-block-size: 4lh;"></div>
     <div class="flex flex-column full-width" style="flex-basis: 48%">
-      <strong>Cards inDoing</strong>
+      <strong>Cards in Doing</strong>
       <p class="txt-x-small margin-none">Fall back to Considering after…</p>
       <%= form_with model: collection, data: { controller: "form" } do |form| %>
         <%= form.select :auto_close_period, collection_auto_close_options, {}, { class: "input input--select full-width margin-block-half txt-small fill-white txt-align-center", data: { action: "change->form#submit" } } %>
@@ -18,4 +18,3 @@
     </div>
   </div>
 </div>
- 
\ No newline at end of file
diff --git a/db/migrate/20250604071718_create_entropy_configurations.rb b/db/migrate/20250604071718_create_entropy_configurations.rb
new file mode 100644
index 000000000..702d4d9cd
--- /dev/null
+++ b/db/migrate/20250604071718_create_entropy_configurations.rb
@@ -0,0 +1,15 @@
+class CreateEntropyConfigurations < ActiveRecord::Migration[8.1]
+  def change
+    create_table :entropy_configurations do |t|
+      t.references :container, polymorphic: true, null: false, index: { unique: true }
+
+      t.bigint :auto_close_period, null: false, default: 30.days.to_i
+      t.bigint :auto_reconsider_period, null: false, default: 30.days.to_i
+
+      t.timestamps
+
+      t.index %i[ container_type container_id auto_close_period ]
+      t.index %i[ container_type container_id auto_reconsider_period ]
+    end
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 7acec01bd..8c1642ea4 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[8.1].define(version: 2025_06_01_161653) do
+ActiveRecord::Schema[8.1].define(version: 2025_06_04_080022) do
   create_table "accesses", force: :cascade do |t|
     t.integer "collection_id", null: false
     t.datetime "created_at", null: false
@@ -141,13 +141,11 @@ ActiveRecord::Schema[8.1].define(version: 2025_06_01_161653) do
 
   create_table "collections", force: :cascade do |t|
     t.boolean "all_access", default: false, null: false
-    t.bigint "auto_close_period"
     t.datetime "created_at", null: false
     t.integer "creator_id", null: false
     t.string "name", null: false
     t.datetime "updated_at", null: false
     t.integer "workflow_id"
-    t.index ["auto_close_period"], name: "index_collections_on_auto_close_period"
     t.index ["creator_id"], name: "index_collections_on_creator_id"
     t.index ["workflow_id"], name: "index_collections_on_workflow_id"
   end
@@ -188,6 +186,18 @@ ActiveRecord::Schema[8.1].define(version: 2025_06_01_161653) do
     t.index ["filter_id"], name: "index_creators_filters_on_filter_id"
   end
 
+  create_table "entropy_configurations", force: :cascade do |t|
+    t.bigint "auto_close_period", default: 2592000, null: false
+    t.bigint "auto_reconsider_period", default: 2592000, null: false
+    t.integer "container_id", null: false
+    t.string "container_type", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["container_type", "container_id", "auto_close_period"], name: "idx_on_container_type_container_id_auto_close_perio_74dc880875"
+    t.index ["container_type", "container_id", "auto_reconsider_period"], name: "idx_on_container_type_container_id_auto_reconsider__583aaddbea"
+    t.index ["container_type", "container_id"], name: "index_entropy_configurations_on_container", unique: true
+  end
+
   create_table "events", force: :cascade do |t|
     t.string "action", null: false
     t.integer "collection_id", null: false
diff --git a/db/schema_cache.yml b/db/schema_cache.yml
index e4a61d5f1..e29b9c902 100644
--- a/db/schema_cache.yml
+++ b/db/schema_cache.yml
@@ -495,16 +495,6 @@ columns:
     default_function:
     collation:
     comment:
-  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
-    auto_increment:
-    name: auto_close_period
-    cast_type: *11
-    sql_type_metadata: *12
-    'null': true
-    default:
-    default_function:
-    collation:
-    comment:
   - *5
   - *24
   - *6
@@ -585,6 +575,50 @@ columns:
   creators_filters:
   - *24
   - *19
+  entropy_configurations:
+  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+    auto_increment:
+    name: auto_close_period
+    cast_type: *11
+    sql_type_metadata: *12
+    'null': false
+    default: 2592000
+    default_function:
+    collation:
+    comment:
+  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+    auto_increment:
+    name: auto_reconsider_period
+    cast_type: *11
+    sql_type_metadata: *12
+    'null': false
+    default: 2592000
+    default_function:
+    collation:
+    comment:
+  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+    auto_increment:
+    name: container_id
+    cast_type: *1
+    sql_type_metadata: *2
+    'null': false
+    default:
+    default_function:
+    collation:
+    comment:
+  - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
+    auto_increment:
+    name: container_type
+    cast_type: *7
+    sql_type_metadata: *8
+    'null': false
+    default:
+    default_function:
+    collation:
+    comment:
+  - *5
+  - *6
+  - *9
   events:
   - !ruby/object:ActiveRecord::ConnectionAdapters::SQLite3::Column
     auto_increment:
@@ -997,6 +1031,7 @@ primary_keys:
   commands: id
   comments: id
   creators_filters:
+  entropy_configurations: id
   events: id
   filters: id
   filters_stages:
@@ -1035,6 +1070,7 @@ data_sources:
   commands: true
   comments: true
   creators_filters: true
+  entropy_configurations: true
   events: true
   filters: true
   filters_stages: true
@@ -1447,22 +1483,6 @@ indexes:
     comment:
     valid: true
   collections:
-  - !ruby/object:ActiveRecord::ConnectionAdapters::IndexDefinition
-    table: collections
-    name: index_collections_on_auto_close_period
-    unique: false
-    columns:
-    - auto_close_period
-    lengths: {}
-    orders: {}
-    opclasses: {}
-    where:
-    type:
-    using:
-    include:
-    nulls_not_distinct:
-    comment:
-    valid: true
   - !ruby/object:ActiveRecord::ConnectionAdapters::IndexDefinition
     table: collections
     name: index_collections_on_creator_id
@@ -1646,6 +1666,60 @@ indexes:
     nulls_not_distinct:
     comment:
     valid: true
+  entropy_configurations:
+  - !ruby/object:ActiveRecord::ConnectionAdapters::IndexDefinition
+    table: entropy_configurations
+    name: idx_on_container_type_container_id_auto_close_perio_74dc880875
+    unique: false
+    columns:
+    - container_type
+    - container_id
+    - auto_close_period
+    lengths: {}
+    orders: {}
+    opclasses: {}
+    where:
+    type:
+    using:
+    include:
+    nulls_not_distinct:
+    comment:
+    valid: true
+  - !ruby/object:ActiveRecord::ConnectionAdapters::IndexDefinition
+    table: entropy_configurations
+    name: idx_on_container_type_container_id_auto_reconsider__583aaddbea
+    unique: false
+    columns:
+    - container_type
+    - container_id
+    - auto_reconsider_period
+    lengths: {}
+    orders: {}
+    opclasses: {}
+    where:
+    type:
+    using:
+    include:
+    nulls_not_distinct:
+    comment:
+    valid: true
+  - !ruby/object:ActiveRecord::ConnectionAdapters::IndexDefinition
+    table: entropy_configurations
+    name: index_entropy_configurations_on_container
+    unique: true
+    columns:
+    - container_type
+    - container_id
+    lengths: {}
+    orders: {}
+    opclasses: {}
+    where:
+    type:
+    using:
+    include:
+    nulls_not_distinct:
+    comment:
+    valid: true
   events:
   - !ruby/object:ActiveRecord::ConnectionAdapters::IndexDefinition
     table: events
@@ -2137,4 +2211,4 @@ indexes:
     comment:
     valid: true
   workflows: []
-version: 20250601161653
+version: 20250604080022
diff --git a/test/fixtures/collections.yml b/test/fixtures/collections.yml
index 2f00b7646..f08054e6c 100644
--- a/test/fixtures/collections.yml
+++ b/test/fixtures/collections.yml
@@ -2,11 +2,9 @@ writebook:
   name: Writebook
   creator: david
   all_access: true
-  auto_close_period: <%= 30.days.to_i %>
   workflow: qa
 
 private:
   name: Private collection
   creator: kevin
   all_access: false
-  auto_close_period: <%= 30.days.to_i %>
diff --git a/test/fixtures/entropy/configurations.yml b/test/fixtures/entropy/configurations.yml
new file mode 100644
index 000000000..3046b360f
--- /dev/null
+++ b/test/fixtures/entropy/configurations.yml
@@ -0,0 +1,9 @@
+writebook_collection:
+  container: writebook (Collection)
+  auto_reconsider_period: <%= 30.days.to_i %>
+  auto_close_period: <%= 30.days.to_i %>
+
+private_collection:
+  container: private (Collection)
+  auto_reconsider_period: <%= 30.days.to_i %>
+  auto_close_period: <%= 30.days.to_i %>
diff --git a/test/models/card/entropy_test.rb b/test/models/card/entropy_test.rb
index 2c20f58a8..682c6dc0a 100644
--- a/test/models/card/entropy_test.rb
+++ b/test/models/card/entropy_test.rb
@@ -8,7 +8,7 @@ class Card::EntropyTest < ActiveSupport::TestCase
   test "auto_close_at infers the period from the collection" do
     freeze_time
 
-    collections(:writebook).update! auto_close_period: 123.days
+    entropy_configurations(:writebook_collection).update! auto_close_period: 123.days
     cards(:layout).update! last_active_at: 2.day.ago
     assert_equal (123-2).days.from_now, cards(:layout).auto_close_at
   end
@@ -16,8 +16,8 @@ class Card::EntropyTest < ActiveSupport::TestCase
   test "auto close all due" do
     cards(:logo, :shipping).each(&:reconsider)
 
-    cards(:logo).update!(last_active_at: 1.day.ago - collections(:writebook).auto_close_period)
-    cards(:shipping).update!(last_active_at: 1.day.from_now - collections(:writebook).auto_close_period)
+    cards(:logo).update!(last_active_at: 1.day.ago - entropy_configurations(:writebook_collection).auto_close_period)
+    cards(:shipping).update!(last_active_at: 1.day.from_now - entropy_configurations(:writebook_collection).auto_close_period)
 
     assert_difference -> { Card.closed.count }, +1 do
       Card.auto_close_all_due
@@ -30,7 +30,7 @@ class Card::EntropyTest < ActiveSupport::TestCase
   test "don't auto close those cards where the collection has no auto close period" do
     cards(:logo, :shipping).each(&:reconsider)
 
-    collections(:writebook).update auto_close_period: nil
+    collections(:writebook).entropy_configuration.destroy
 
     assert_no_difference -> { Card.closed.count } do
       Card.auto_close_all_due