diff --git a/chrono/api/serializers.py b/chrono/api/serializers.py
index feba6530..a02b7605 100644
--- a/chrono/api/serializers.py
+++ b/chrono/api/serializers.py
@@ -188,6 +188,18 @@ class RecurringFillslotsSerializer(MultipleAgendasEventsFillSlotsSerializer):
     check_overlaps = CommaSeparatedStringField(
         required=False, child=serializers.SlugField(max_length=160, allow_blank=False)
     )
+    start_time = serializers.TimeField(required=False)
+    end_time = serializers.TimeField(required=False)
+
+    def validate(self, attrs):
+        super().validate(attrs)
+        use_partial_bookings = any(agenda.partial_bookings for agenda in self.context['agendas'])
+        if use_partial_bookings:
+            if not attrs.get('start_time') or not attrs.get('end_time'):
+                raise ValidationError(_('must include start_time and end_time for partial bookings agenda'))
+            if attrs['start_time'] > attrs['end_time']:
+                raise ValidationError(_('start_time must be before end_time'))
+        return attrs
 
     def validate_slots(self, value):
         super().validate_slots(value)
@@ -401,6 +413,14 @@ class AgendaOrSubscribedSlugsMixin(AgendaSlugsMixin):
             attrs['agenda_slugs'] = [agenda.slug for agenda in agendas]
         else:
             attrs['agenda_slugs'] = self.agenda_slugs
+
+        if any(
+            agenda.partial_bookings != attrs['agendas'][0].partial_bookings for agenda in attrs['agendas']
+        ):
+            raise serializers.ValidationError(
+                {'agendas': _('Cannot mix partial bookings agendas with other kinds.')}
+            )
+
         return attrs
 
     def validate_agendas(self, value):
diff --git a/chrono/api/views.py b/chrono/api/views.py
index b13bec83..e34b6b4b 100644
--- a/chrono/api/views.py
+++ b/chrono/api/views.py
@@ -461,6 +461,8 @@ def make_booking(event, payload, extra_data, primary_booking=None, in_waiting_li
         user_display_label=payload.get('user_display_label', ''),
         extra_emails=payload.get('extra_emails', []),
         extra_phone_numbers=payload.get('extra_phone_numbers', []),
+        start_time=payload.get('start_time'),
+        end_time=payload.get('end_time'),
         extra_data=extra_data,
         color=color,
     )
diff --git a/tests/api/fillslot/test_recurring_events.py b/tests/api/fillslot/test_recurring_events.py
index e804db7a..975abab1 100644
--- a/tests/api/fillslot/test_recurring_events.py
+++ b/tests/api/fillslot/test_recurring_events.py
@@ -16,7 +16,7 @@ from chrono.agendas.models import (
     SharedCustodyRule,
     Subscription,
 )
-from chrono.utils.timezone import now
+from chrono.utils.timezone import make_aware, now
 
 pytestmark = pytest.mark.django_db
 
@@ -1609,7 +1609,7 @@ def test_recurring_events_api_fillslots_overlapping_events(app, user):
 
 
 @pytest.mark.freeze_time('2021-09-06 12:00')
-def test_recurring_events_api_fillslots_overlapping_events_partial_booking(app, user):
+def test_recurring_events_api_fillslots_partly_overlapping_events(app, user):
     agenda = Agenda.objects.create(label='First Agenda', kind='events')
     Desk.objects.create(agenda=agenda, slug='_exceptions_holder')
     start, end = now(), now() + datetime.timedelta(days=30)
@@ -1677,3 +1677,63 @@ def test_recurring_events_api_fillslots_overlapping_events_partial_booking(app,
         '2021-09-28',
         '2021-10-05',
     ]
+
+
+@pytest.mark.freeze_time('2023-05-01 10:00')
+def test_recurring_events_api_fillslots_partial_bookings(app, user):
+    agenda = Agenda.objects.create(label='Foo bar', kind='events', partial_bookings=True)
+    Desk.objects.create(agenda=agenda, slug='_exceptions_holder')
+    start_datetime = make_aware(datetime.datetime(2023, 5, 2, 8, 0))
+    event = Event.objects.create(
+        label='Event 08-18',
+        start_datetime=start_datetime,
+        end_time=datetime.time(18, 00),
+        places=2,
+        recurrence_end_date=start_datetime + datetime.timedelta(days=30),
+        recurrence_days=[1],
+        agenda=agenda,
+    )
+    event.create_all_recurrences()
+
+    app.authorization = ('Basic', ('john.doe', 'password'))
+
+    params = {
+        'user_external_id': 'user_id',
+        'slots': 'foo-bar@event-08-18:1',
+        'start_time': '10:00',
+        'end_time': '15:00',
+    }
+    fillslots_url = '/api/agendas/recurring-events/fillslots/?action=update&agendas=%s' % agenda.slug
+    resp = app.post_json(fillslots_url, params=params)
+
+    assert Booking.objects.count() == 5
+    for booking in Booking.objects.all():
+        assert booking.start_time == datetime.time(10, 00)
+        assert booking.end_time == datetime.time(15, 00)
+
+    # mix with other kind
+    other_agenda = Agenda.objects.create(label='Not partial', kind='events')
+    resp = app.post_json(fillslots_url + ',%s' % other_agenda.slug, params=params, status=400)
+    assert resp.json['errors']['agendas'][0] == 'Cannot mix partial bookings agendas with other kinds.'
+
+    # missing start_time
+    del params['start_time']
+    resp = app.post_json(fillslots_url, params=params, status=400)
+    assert (
+        resp.json['errors']['non_field_errors'][0]
+        == 'must include start_time and end_time for partial bookings agenda'
+    )
+
+    # missing end_time
+    params['start_time'] = '10:00'
+    del params['end_time']
+    resp = app.post_json(fillslots_url, params=params, status=400)
+    assert (
+        resp.json['errors']['non_field_errors'][0]
+        == 'must include start_time and end_time for partial bookings agenda'
+    )
+
+    # end before start
+    params['end_time'] = '09:00'
+    resp = app.post_json(fillslots_url, params=params, status=400)
+    assert resp.json['errors']['non_field_errors'][0] == 'start_time must be before end_time'