you don't have to let it sit for any period of time.

the most common recipe I have seen on these threads is Master Wu's Difinitive Green Dragon.

basically, just boil 2 oz Bacardi 151 with 1/8th powdered (grind in blender) erb. boil at like 173 degrees for 20 min over a double boiler/bubbler (heat the alcohol weed mix with steam, not over direct heat) then strain and drink a tablespoon!

peace