Ok, simplified version : lets say you don't get high on weed until after heat is applied and THCa is converted to THC
Same goes for CBDa... you dont get medicinal effects until after heat is applied and CBDa is converted to CBD
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Now with a quality CBD plant check out the CBD (good stuff) levels and compare to the CBDa (inactive stuff) levels
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That's why you need to get rid of the "a"
I manufacture CBD products so my exact time and my exact temps are proprietary (as are most others that do this) but for a general household decarb of CBD a good range is 280F for 80 - 90 minutes.
And you want to be sure your pan is covered fairly tight, and that your oven setting is calibrated.
Peace
Hash