i said it somewhere else before...if you're like an every day smoker try to wait about 3 weeks so it gets built up nice and good, or after about every ounce...two if you want it extra thick....also you can make resin form faster by dropping a drop or two of water on the weed before you spark up....i read somewhere that resin tends to form in more moist/damp enviroments...i tested this theory and it does work....gives you the nice black liquid resin...veeeeeeeeeryyyyyy yummy!