Home » Making Edibles » How long to decarb an ounce of shake Making Edibles How long to decarb an ounce of shake toddfarmer March 18, 2020 302 Views 0 SaveSavedRemoved 0 Decarb an ounce of shake for 40 minutes at 240 At what temperature, and for how long, should I decarb my cannabis in the oven? The answer: 40 minutes at 240.