diff --git a/reinheit/apps/brew/migrations/0003_remove_chemicaladdition_added_and_more.py b/reinheit/apps/brew/migrations/0003_remove_chemicaladdition_added_and_more.py
new file mode 100644
index 0000000..309c559
--- /dev/null
+++ b/reinheit/apps/brew/migrations/0003_remove_chemicaladdition_added_and_more.py
@@ -0,0 +1,41 @@
+# Generated by Django 5.0.6 on 2024-06-28 19:55
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("brew", "0002_hopaddition"),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name="chemicaladdition",
+            name="added",
+        ),
+        migrations.RemoveField(
+            model_name="fermentableaddition",
+            name="added",
+        ),
+        migrations.RemoveField(
+            model_name="hopaddition",
+            name="added",
+        ),
+        migrations.RemoveField(
+            model_name="maltaddition",
+            name="added",
+        ),
+        migrations.RemoveField(
+            model_name="yeastaddition",
+            name="added",
+        ),
+        migrations.AddField(
+            model_name="hopaddition",
+            name="boil_time",
+            field=models.PositiveIntegerField(
+                default=0, help_text="Number of minutes boiled"
+            ),
+            preserve_default=False,
+        ),
+    ]
diff --git a/reinheit/apps/brew/models.py b/reinheit/apps/brew/models.py
index 77f4aee..f9b1a9c 100644
--- a/reinheit/apps/brew/models.py
+++ b/reinheit/apps/brew/models.py
@@ -40,9 +40,7 @@ class Brew(models.Model):
 
 class AbstractAddition(models.Model):
     brew = models.ForeignKey("Brew", on_delete=models.CASCADE)
-
     mass = models.FloatField(help_text="The mass of ingredient added")
-    added = models.DateTimeField(null=True)
 
     @property
     def unit(self):
@@ -73,3 +71,5 @@ class ChemicalAddition(AbstractAddition):
 
 class HopAddition(AbstractAddition):
     ingredient = models.ForeignKey("ingredients.Hop", on_delete=models.PROTECT)
+
+    boil_time = models.PositiveIntegerField(help_text="Number of minutes boiled")