spaces like this are ALL about the professional airless sprayer and a guy backrolling.
A little extra prep time in taping off windows and anything else you dont want to overspray, but if time and quality is what you want then that is the method to use. Spraying does not even need to be perfect since you have a guy backrolling.
I painted my way through college and grad school, so I speaking from experience. 2 guys can get 2 coats on in one long day.
Then finish off your ceailing the next day.
Then topcoat the walls the next by hand with brush and roller.
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