2 guys, 46 apartments, 4 days, using 2 18"x3/4 knit and 6x1/2 lambskin button tip. 3 1/2 gallon Liebco "Big Time" paint tray mounted to a fold-up handled suitcase cart. One guy masking off base w/2" shurtape and removing the cover plates and taping over sockets takes less than three minutes, while other guy cuts in ceiling, around 2 doors, corners, and window with mini lamb. Then masker become paint loader, so there's a continuous wet roller going, roll down onto the tape, eliminating cutting in the base and floor tarps. Elapsed time: 11 minutes/room.
We've 2 victories in 2 races against sprayers.