These docs are for an old release.
Info on upgrading to v5
defaultAllDayEventDuration
A fallback duration for all-day Event Objects without a specified end value.
Duration, default: { days: 1 }
If an event does not have an end specified, it will appear to be this duration when rendered.
The actual end of the event will remain unset unless forceEventDuration has been set to true.
This setting only affects events with allDay equal to true. For timed events, use defaultTimedEventDuration.