Mavericks calendar events longer than 3 hours I am using Mavericks.

I use Calendar in monthly mode and with times in 24 hour mode.

When I enter or edit an event in Calendar.app it seems to be limited to 3 hours.
First you have to deselect the whole day then the list of end times only goes to 3 hours, which I can live with. But if I close the drop down and try to edit the end time end time directly as if I put in a later time Calendar changes it to 3 hours. However only sometimes (about 50% success)

How do I enter an entry longer than 3 hours?
I use the + quick event button which is the same as Command-N to enter:

meeting from 10am to 5pm on thursday


It makes blocking specific times quite easy using Calendar app. I also often use the week or day view and create a default event and drag the bottom of the event to the end time.

Lastly, I select the hour when I mouse to raise the quick interval drop down and rather than use the mouse to change the end time, just type the hour and tab to the minutes field if necessary.