I've made MJ oil two times before and the first time it was KILLER. I burned the weed, but it still made perfect brownies and 1/16th of the batch (5 grams of mid-grade bud in the oil) was a goooood high. The second one wasn't as powerful, made with the same type stuff, burned it again. THIS time I will not burn the shit, however I have a question about cooking times. I'm cooking this oil at 180F or a little more, the blended buds are still green (thank god not burned) and I'm planning on leaving it for only 30 minutes. Is 30 minutes enough time to extract as much THC as possible? This is what I want to know. It worked for me once very very well, I don't want to botch this. The internet isn't telling me what I want to know, and a lot of recipes ask for 30 minutes to 24 hours so WTF is that.