I have been using mason jars to decarb for a couple of years now. My edibles work great, friends and family love them. I started out using a kitchen oven set to 250f for 40 mins, that has been my standard for ever. I built a PID controled toaster oven and it holds a temp I set and it stays there. The contents are always a dark green, never the light golden brown. So I started wondering about what is the air temp in the jar? And and how long does it take to match the air temp in the oven cavity? So I set up a test rig using both a kitchen oven and my PID controled toaster oven. Making sure the probe temp matches a cooking probe. Both match. Jar setup for testing. How I placed the probe in the jar. PID toaster oven. What I found is it took the air in the jar between 21 to 26 mins to match the oven internal temp. So what I am thinking is I am only really decarbing for 20mins during a 40min decarb. I ran a test last night I started the 40min timer after the jar air temp reached 115c / 240f. And I finally got the nice light golden brown cannabis. I want to hear peoples thoughts on this.