Although these protocols seem to require slightly more total exercise time to be effective, they still are well below the steady state exercise time requirements. (journals.lww.com)
If you're doing 15 - 25 sets of total exercise, you should be able to get everything done within that 45 minute block. (nerdfitness.com)
Joe Weider had a Full body workout of 3 different routines of 14 total exercises performed every other day. (muscleandbrawn.com)