Not very long. It’s about the same amount of time that you would cook raw oats and they don’t need to boil away, just a little simmer for five or ten minutes will do. Be very careful because the acorns like to stick to the pan, so bring the heat up slowly and stir constantly. Remember, the cooking of the acorns comes AFTER they are leached. It doesn’t take a lot of effort to leach the acorns, it’s the shelling that takes a little bit of your time but you can put your feet up and relax while doing it, even listen to music or turn on a movie. Acorns are a wonderful addition to any dish you make, the effort is worth it.
Suellen Ocean is the author of Acorns and Eat’em, a how-to vegetarian cookbook and field guide for eating acorns. Find it here: http://www.amazon.com/Acorns-Eatem-How–Vegetarian-Cookbook/dp/1491288973