Hi Meister,
Thanks for your interest in Vacation Request!
It appears that the feature you reported on is not working as designed. The design calls for a StartTime of 0600 and an EndTime of 1800 to cover most all business days, not the 1200 to 1200 that is currently being updated in the appointment. I'll get out a point release to remediate this shortcoming.
Until the fix is published, once the appointment is on your calendar you can adjust the appointment times in your calendar.
Sorry for the inconvenience,
Bob