I have better experience with Bee quick than the previous posters. But time to clear the supers will vary based on outside temp and how sunny it is. what ever you use as you fume board the top should be black to absorb more heat from the son. I wouldn't use it to just put an excluder on. Nothing works very well to clear supers if there is any brood. I have used a torch or hair dryer to heat the top of fume board on cooler days.Will a piece of cardboard work for a fume board?
How long does it usually take to clear the supers?
What is the min. outside temp should it be to use bee quick? I want to installs some queen excluders and its only going to reach 65 here today. thanks!!