From what I have been told you don't really need to soak anything in alcohol for more than 3 days. By then all of the resin should be off of the plant and the material can be strained out. Now I cant confirm that, just sharing what I have been told. When I make oil I plan on using butane. Much cleaner. Water is polar and butane is non polar. Alcohol contains water which will break down the chlorophyll which is why alcohol made oil is black or green instead of amber or honey colored. Butane is non polar so it will only break down the resins in and on the plant, and when purged properly you are only smoking cannabis resins and not cannabis plant material. Don't get me wrong nothing against alcohol made oils. Wish I had some, hell I might take the tiny bit of trim from my autos and make some up with some 90% rubbing alcohol or what I can find. Just to try the method out. Its not like smoking chlorophyll is bad, we do it every time we smoke some bud.