Dave; Our organization has the same scenario and while I’m not on point for configuring the solution, I think its rather simple. First, setup a second enterprise level calendar that reflects the contractor 10 hour day work week. When completed, there should be at least two base calendars at the enterprise level. A standard one for M-F 8-5 and another for the contractors. By default, the base calendar is the Standard, or M-F 8-5 calendar. For those resources that are contractors, change their base calendar to the new 10 hour day calendar. This is done in the Resource Sheet view by changing the value in the “Base” field to point to the new calendar name.