[whpalmer4]

I suspect what you want is the ability to assign a specific percentage of hours to a project, with no assumptions made about equal divisions as my example unfortunately promotes. I'm sure there are users who would prefer to be able to do it based on a number of hours instead of a percentage (just like you see with completion percentages), so it would be nice if the UI made that possible. Maybe something like the way Disk Utility lets you carve up a disk into partitions, with a setting that is the baseline (equivalent of a project's normal work week), and the ability to alter it for a period of time (off and additional hours).