[matwood]

I agree with you, but devils advocate wants me to ask if you can define the full time work they are expected to do?

What if my definition of full time work takes person A 60 hours and person B 30 hours?

[ghaff]

Well, if person B being able to handle a given workload in 30 hours is roughly the norm, and someone else consistently takes 60, you probably have a performance problem to deal with. (And, yes, a lot of this stuff is hard to specify and measure.)