You are right Charlie,
but an hour tastes too much like cannabis for some folks.
I love it myself.
The longer you cook it the better it tastes to some.
The longer you cook it the more likely you will reach the vaporization temp for THC(320-340 degrees).
Keep it under 300 and you got no worries, even without a lid.
A pressure cooker has a temp gauge in the lid, doesn't it.
When you remove a lid from a boiling pot, The temp drops.
When you stick your thermometer in it, at that point, you are not reading the true temp.
When you open the lid the vapor rises since it is warmer than the surrounding air.
With a pressure cooker you never have to open it to see the temp
Then you have the vaporization temp for CBC, CBN, CBD and the rest of the CBs