I've been experimenting earlier this year. It takes 45 to 50mn for it to take effect, the high is amazing and lasts for about six hours. It's also kind to my lungs
45 to 50 min is a good rule of thumb, but it depends on your metabolism and what you've eaten recently. To anyone reading, know yourself and know your substance.
Last cake I baked I completely eyeballed it. I ground a few buds in the oven and simmered them into butter for a while, pressed them through some gauze and added the result (a very green butter) to my cake mix. I tried to dose it by making the cake the equivalent of, say, ten joints.