eXo Platform offers the end-date suggestion feature in Calendar that you can change in the following files. See Configuration overview for how-to.
# auto suggest the end of event time to 1 hour (2 x 30 min)
# auto suggest the end of task time to 30 minutes (1 x 30 min)
The numeric value of duration suggestion is complied with the following rules: 1 = 30 minutes, 2 = 1 hour, 3 = 1 hour 30 minutes, 4 = 2 hours. This means 1 block equals to 30 minutes.
exo.calendar.default.event.suggest: Defines the duration of an event.
That is, if the start-time is 7:00AM in the From field, the end-time will be auto-increased to 8:00AM in the To field.
"2" is set by default for the duration of events.
exo.calendar.default.task.suggest: Defines the duration of a task.
That is, if the start-time is 7:00AM in the From field, the end-time will be auto-increased to 7:30AM in the To field.
"1" is set by default for the duration of tasks.