I’ve seen charts that use a different timeline, that show THCa conversion ~85% complete after 30 min. - which is to say, about the time it takes the heater to reach temperature...taking it much farther percentage-wise takes much more time, and results in more CBN.
It would be good to track the conversion process through those first 30 min to see if there’s an optimum point, beyond which we just burn electricity for no further gain. Medicinal value in THCa, so it seems like a happy medium to be relaxed about it.
The chart I use is the one romanoweed posted on post 58, jump117 posted it in his thread also a few years back.
Looks like I should have been going for 250/30 mins. instead of 220/30 mins, not sure if that was a typing error, or attempt to preserve more terpenes at lower temps.
I use an second thermo meter in the oven while decarbing, for more accurate temps. Usually preheat the pan in oven, add pot, set timer a minute or two longer than target time to get pot up to temp