diff --git a/addons/project/static/src/js/project_calendar.js b/addons/project/static/src/js/project_calendar.js
index d8db099a2b7..37943fad6ed 100644
--- a/addons/project/static/src/js/project_calendar.js
+++ b/addons/project/static/src/js/project_calendar.js
@@ -1,6 +1,7 @@
 /** @odoo-module **/
 
 import CalendarController from 'web.CalendarController';
+import CalendarModel from 'web.CalendarModel';
 import CalendarView from 'web.CalendarView';
 import viewRegistry from 'web.view_registry';
 import { ProjectControlPanel } from '@project/js/project_control_panel';
@@ -18,10 +19,23 @@ const ProjectCalendarController = CalendarController.extend({
     },
 });
 
+const ProjectCalendarModel = CalendarModel.extend({
+    /**
+     * @private
+     * @override
+     */
+    _getFullCalendarOptions: function () {
+        const options = this._super(...arguments);
+        options.eventDurationEditable = false;
+        return options;
+    }
+})
+
 export const ProjectCalendarView = CalendarView.extend({
     config: Object.assign({}, CalendarView.prototype.config, {
         Controller: ProjectCalendarController,
         ControlPanel: ProjectControlPanel,
+        Model: ProjectCalendarModel,
     }),
 });