diff --git a/turkle/migrations/0014_alter_batch_allotted_assignment_time_and_more.py b/turkle/migrations/0014_alter_batch_allotted_assignment_time_and_more.py
new file mode 100644
index 00000000..ed23c1ff
--- /dev/null
+++ b/turkle/migrations/0014_alter_batch_allotted_assignment_time_and_more.py
@@ -0,0 +1,34 @@
+# Generated by Django 4.2.23 on 2025-06-28 15:40
+
+import django.core.validators
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('turkle', '0013_activeproject_activeuser'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='batch',
+            name='allotted_assignment_time',
+            field=models.IntegerField(default=24, validators=[django.core.validators.MinValueValidator(1)]),
+        ),
+        migrations.AlterField(
+            model_name='batch',
+            name='assignments_per_task',
+            field=models.IntegerField(default=1, validators=[django.core.validators.MinValueValidator(1)], verbose_name='Assignments per Task'),
+        ),
+        migrations.AlterField(
+            model_name='project',
+            name='allotted_assignment_time',
+            field=models.IntegerField(default=24, validators=[django.core.validators.MinValueValidator(1)]),
+        ),
+        migrations.AlterField(
+            model_name='project',
+            name='assignments_per_task',
+            field=models.IntegerField(db_index=True, default=1, validators=[django.core.validators.MinValueValidator(1)]),
+        ),
+    ]
diff --git a/turkle/models.py b/turkle/models.py
index a7faa4e0..a16e1eac 100644
--- a/turkle/models.py
+++ b/turkle/models.py
@@ -11,6 +11,7 @@
 from django.conf import settings
 from django.contrib.auth import get_user_model
 from django.core.exceptions import ValidationError
+from django.core.validators import MinValueValidator
 from django.db import models
 from django.db.models import Count, IntegerField, Max, Q, OuterRef, Prefetch, Subquery
 from django.db.models.functions import Coalesce
@@ -226,13 +227,24 @@ class Meta:
         verbose_name_plural = "Batches"
 
     active = models.BooleanField(db_index=True, default=True)
-    allotted_assignment_time = models.IntegerField(default=24)
-    assignments_per_task = models.IntegerField(default=1, verbose_name='Assignments per Task')
+    allotted_assignment_time = models.IntegerField(
+        default=24,
+        validators=[MinValueValidator(1)]
+    )
+    assignments_per_task = models.IntegerField(
+        default=1,
+        validators=[MinValueValidator(1)],
+        verbose_name='Assignments per Task'
+    )
     completed = models.BooleanField(default=False)
     created_at = models.DateTimeField(auto_now_add=True)
-    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, null=True,
-                                   related_name='created_batches', on_delete=models.CASCADE,
-                                   verbose_name='creator')
+    created_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        related_name='created_batches',
+        on_delete=models.CASCADE,
+        verbose_name='creator'
+    )
     custom_permissions = models.BooleanField(default=False)
     filename = models.CharField(max_length=1024)
     login_required = models.BooleanField(db_index=True, default=True)
@@ -769,12 +781,24 @@ class Meta:
         ordering = ['-id']
 
     active = models.BooleanField(db_index=True, default=True)
-    allotted_assignment_time = models.IntegerField(default=24)
-    assignments_per_task = models.IntegerField(db_index=True, default=1)
+    # assignment time is in hours
+    allotted_assignment_time = models.IntegerField(
+        default=24,
+        validators=[MinValueValidator(1)]
+    )
+    assignments_per_task = models.IntegerField(
+        db_index=True,
+        default=1,
+        validators=[MinValueValidator(1)]
+    )
     created_at = models.DateTimeField(auto_now_add=True)
-    created_by = models.ForeignKey(settings.AUTH_USER_MODEL, null=True,
-                                   related_name='created_projects',
-                                   on_delete=models.CASCADE, verbose_name='creator')
+    created_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        related_name='created_projects',
+        on_delete=models.CASCADE,
+        verbose_name='creator'
+    )
     custom_permissions = models.BooleanField(default=False)
     filename = models.CharField(max_length=1024, blank=True)
     html_template = models.TextField()
@@ -782,10 +806,12 @@ class Meta:
     login_required = models.BooleanField(db_index=True, default=True)
     name = models.CharField(max_length=1024)
     updated_at = models.DateTimeField(auto_now=True)
-    updated_by = models.ForeignKey(settings.AUTH_USER_MODEL, null=True,
-                                   related_name='updated_projects',
-                                   on_delete=models.CASCADE)
-
+    updated_by = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        null=True,
+        related_name='updated_projects',
+        on_delete=models.CASCADE
+    )
     # Fieldnames are automatically extracted from html_template text
     fieldnames = JSONField(blank=True)