Viagro, I understand and agree with your confusion about cannabutter cooking times. I have seen some recipes that are quick, and some that take a VERY long time. My understanding is that longer you cook it, the more thc you extract. But I honestly don't know if that means cooking it for longer makes it stronger. That's why I chose the recipe I did, because of all the ones I have looked up, it seemed to be the average cooking time. I think the only way to test it would be to choose 2 or 3 recipes, all calling for different times, and use the same amounts for all. Next time I make cannabutter that is what I am going to do...if I end up with that much trim after our next harvest, that is! Would be interested in seeing which one comes out strongest. I'll keep you posted, or if you try it, let me know the results!
As far as coconut oil, it should make for a great thc oil. Coconut oil is a VERY stable oil with a smoke point (the temp at which the oil begins to smoke, and ultimately, burn) of 360 F, so it can be used for almost anything without having the flavor altered. I don't know if you have seen my thc oil recipe, but I posted one (page 5 of this thread) that will work with ANY oil. Kind of a long cooking time because it is done in a crock pot, but it's basically fool proof. If you don't have a crock pot you could do it on the stovetop, keeping it at a VERY low temp, and cooking for at least 2 hours. Coconut oil has a lower fat content than most oils so the longer and slower you cook it, the better the extraction will be. Give it a try!
Hope I helped!