These docs are for an old release.
Info on upgrading to version 2/3
defaultEventMinutes 1.4
Determines the length (in minutes) an event appears to be when it has an unspecified end date.
Integer, default: 120
By default, if an Event Object as no end, it will appear to be 2 hours.
This option only affects events that appear in the agenda slots, meaning they have allDay set to true.