Requesting Set up and/or Clean up times

Instead of having requestors enter the minutes for set up and clean it, it would be easier if a time could be selected. Some of our groups get confused and fill out the set up/clean up incorrectly, or they disregard it all together. The requestor should be able to enter the actual times for each of the following: set up time, event time, end time and clean up time instead of adding in the number of minutes needed.