diff --git a/addons/base_calendar/crm_meeting_view.xml b/addons/base_calendar/crm_meeting_view.xml
index 79a3b6d1c78..f2eec8ec19c 100644
--- a/addons/base_calendar/crm_meeting_view.xml
+++ b/addons/base_calendar/crm_meeting_view.xml
@@ -101,7 +101,7 @@
                                     <label for="allday" string="All Day?"/>)
                                 </div>
                                 <field name="date_deadline" groups="base.group_no_one"
-                                    attrs="{'invisible': [('allday','=',True)]}"
+                                    attrs="{'invisible': ['|', ('allday','=',True), ('duration','&lt;=', 24)]}"
                                     on_change="onchange_dates(date,False,date_deadline)"/>
                             </group>
                             <group>