Bulk Upload - Other Events

We use other events to record our half day discretional days at Christmas where everyone has the afternoon off. As other events are recorded in a 24 hour clock and are not linked to working patterns you can't just specify a half working day which is frustrating. Then if you bulk upload the half days confirming the number of hours it won't let you specify the times so our half day afternoons are pushed into calendars with the wrong times and show as being from 09.00-12.45 in the morning, the only way to change this is to go in manually one by one and change them, this is not practical for 800+ employees.