i hotboxed my room once.....a small ass room with a 1 foot acrylic 2 hitter (could be 4 but we didn't have the other two tubes) another small 1 footer single hitter. a coupe of pipes a couple of sweets....we went through over an ounce in under half an hour...but you coudln't see across the room too well lol there was just that much smoke in the room.....my room will stilll smell like weed if i turn off the air and leave it alone for awhile (probably because i still smoke in it but it was alot of fukin smoke in this room..lol)