diff --git a/.env.example b/.env.example
index 1f4f388..defb4fe 100644
--- a/.env.example
+++ b/.env.example
@@ -8,6 +8,7 @@ PURCHASE_CHECKOUT_EXPIRATION_MINUTES=30
 PURCHASE_QR_EXPIRATION_MINUTES=15
 PURCHASE_TELEPAGOS_EXPIRATION_MINUTES=30
 PURCHASE_TRANSFER_EXPIRATION_MINUTES=1440
+STOCK_RESERVATION_EXPIRATION_MINUTES=30
 FRONTEND_URLS=http://localhost:4200
 
 APP_LOCALE=es
diff --git a/app/Domains/Catalog/Services/StockReservationService.php b/app/Domains/Catalog/Services/StockReservationService.php
index e6a1053..24a7f51 100644
--- a/app/Domains/Catalog/Services/StockReservationService.php
+++ b/app/Domains/Catalog/Services/StockReservationService.php
@@ -7,6 +7,7 @@ use App\Domains\Catalog\Models\CatalogItem;
 use App\Domains\Catalog\Models\StockReservation;
 use App\Domains\Catalog\Models\Variant;
 use App\Domains\Purchase\Models\Purchase;
+use Illuminate\Support\Carbon;
 use Illuminate\Support\Facades\DB;
 
 class StockReservationService
@@ -71,6 +72,7 @@ class StockReservationService
                     'cart_item_id' => $cartItem->getKey(),
                     'quantity' => $quantity,
                     'status' => StockReservation::STATUS_ACTIVE,
+                    'expires_at' => $this->expiration(),
                 ]);
 
                 continue;
@@ -82,6 +84,7 @@ class StockReservationService
                     'status' => StockReservation::STATUS_ACTIVE,
                     'committed_at' => null,
                     'released_at' => null,
+                    'expires_at' => $this->expiration(),
                 ]);
             }
         }
@@ -111,7 +114,7 @@ class StockReservationService
             ->where('status', StockReservation::STATUS_ACTIVE)
             ->update([
                 'purchase_id' => null,
-                'expires_at' => null,
+                'expires_at' => $this->expiration(),
             ]);
     }
 
@@ -144,7 +147,7 @@ class StockReservationService
                         'cart_item_id' => $target->getKey(),
                         'purchase_id' => null,
                         'quantity' => $perItemQuantity * $targetItemQuantity,
-                        'expires_at' => null,
+                        'expires_at' => $this->expiration(),
                     ]);
 
                     continue;
@@ -153,6 +156,7 @@ class StockReservationService
                 $targetReservation->update([
                     'quantity' => $targetReservation->quantity + $sourceReservation->quantity,
                     'status' => StockReservation::STATUS_ACTIVE,
+                    'expires_at' => $this->expiration(),
                 ]);
                 $sourceReservation->delete();
             }
@@ -170,6 +174,7 @@ class StockReservationService
                     'cart_item_id' => $cartItem->getKey(),
                     'quantity' => $requiredQuantity,
                     'status' => StockReservation::STATUS_ACTIVE,
+                    'expires_at' => $this->expiration(),
                 ]);
 
                 continue;
@@ -180,6 +185,7 @@ class StockReservationService
                 'status' => StockReservation::STATUS_ACTIVE,
                 'committed_at' => null,
                 'released_at' => null,
+                'expires_at' => $this->expiration(),
             ]);
         }
     }
@@ -214,4 +220,11 @@ class StockReservationService
             ->lockForUpdate()
             ->first();
     }
+
+    private function expiration(): Carbon
+    {
+        return now()->addMinutes(
+            max(1, (int) config('catalog.stock_reservation_expiration_minutes', 30)),
+        );
+    }
 }
diff --git a/config/catalog.php b/config/catalog.php
new file mode 100644
index 0000000..4bab7dc
--- /dev/null
+++ b/config/catalog.php
@@ -0,0 +1,5 @@
+<?php
+
+return [
+    'stock_reservation_expiration_minutes' => (int) env('STOCK_RESERVATION_EXPIRATION_MINUTES', 30),
+];
diff --git a/tests/Feature/Cart/CartControllerTest.php b/tests/Feature/Cart/CartControllerTest.php
index c31214a..3438d57 100644
--- a/tests/Feature/Cart/CartControllerTest.php
+++ b/tests/Feature/Cart/CartControllerTest.php
@@ -80,6 +80,30 @@ class CartControllerTest extends TestCase
         ]);
     }
 
+    public function test_it_sets_the_configured_expiration_when_creating_a_stock_reservation(): void
+    {
+        config()->set('catalog.stock_reservation_expiration_minutes', 45);
+        $now = now()->startOfSecond();
+        $this->travelTo($now);
+
+        $tenant = $this->createTenant('acme');
+        $item = $this->createDirectItem($tenant, 10, '49.90');
+
+        $this->postJson('/api/tenants/acme/cart/items', [
+            'catalog_item_id' => $item->id,
+            'cantidad' => 2,
+        ])->assertOk();
+
+        $this->assertDatabaseHas('stock_reservations', [
+            'inventory_id' => $item->inventory_id,
+            'quantity' => 2,
+            'status' => 'active',
+            'expires_at' => $now->copy()->addMinutes(45)->toDateTimeString(),
+        ]);
+
+        $this->travelBack();
+    }
+
     public function test_it_filters_item_images_when_the_tenant_disables_them(): void
     {
         $tenant = $this->createTenant('acme');