Have not been able to enter partial hour (1.5 hours, 2.5 hours) reservations using the hours box.

we have not been able to enter partial hour (1.5 hours, 2.5 hours) reservations using the hours box. I have tried using 2.5 as well as 2:30 and "hours" but it rounds the entry to the whole hour (usually down). The only way we have been able to enter partial hours is using the time in minutes (150 minutes instead of 2.5 hours). We book several situations that require partial hours.