Personally I like to put about an oz of shake/clippings in a potpourri crockpot with 1 lb butter, put the lid on and turn it on, leave it alone till the smell is gone. Depending on the strain, can be as long as 2 days ..48hr. Never gets hot enough to boil so it kinda steeps out. Smells pretty strong for the first 24 hrs. So I don't suppose this method would work for everyone. But has worked dandy for me for the last 30 yrs or so.If I'm not home @ the exact time it's "done", no harm done. It can continue to steep for hours and not be affected adversely. Fool proof and very forgiving