http://boards.cannabis.com/recipes/8...high-chai.html

This was something I posted a while ago. There is also a huge thread about weed milk probably on the next page of this forum.

After decarboxylation in the oven, the longer you simmer the milk would seem to make sure you get more THC out. I would think 10 minutes would be plenty. After it gets hot, turn the heat on low, and just keep stirring. The milk should not boil, it doesn't need to because you already decarboxylated the buds, just keep the temperature high enough to increase extraction by getting the molecules moving around.