Just FYI I paid my guys $1000 + materials and they primed the ceiling. They used 2 hour quickset mud. They started at 7AM and left at 6 PM - sanded and cleaned. Day 2 they painted until about 2 PM. So little over 1.5 days for 2 guys. (note it would take me a week to skim coat a ceiling that size and would look like a kindergartener did it. there is a massive skill/art to skim coating)