If I put a bigger block, say 20-60lbs of dry ice in a foam cooler and poked little holes in the top of it, roughly how long would it last?
I've read people say 1lb will take 1 day in an 8x8x8ft room and get co2 levels around 1500. If thats true, will 2+ lbs last 2+ days or will it evaporate in...