if you have low temps and/or have a cool tube or just run tubes/CLFs .. you might be able to get away with emptying the room in 5 minutes ..
most likely not .. more like 1-3 minuts .. 1 if you live in a place where you got high temps .. unless you of course run a AC in there ..
BTW
I have a cool hood now .. before I had problems keeping the temps under 30C .. actually often 32-34C at summer .. now with the cool hood and summer over I can keep it around them perfect 26-28C
Mate temp is defo not a problem in my room i stay in a very cold place and quite high up my temp is defo not an issue thats one of the easiest things iv had to regulate