Ethanol “crude”?!?
And you’re asking in a “decarb diamonds” thread?
Getting to diamonds is likely to be the hard part.
As far as how long decarb will take: that’s about reactor geometry and heater flow rate.
HX happens at the surface, so surface to volume matters. See: Optimizing Processes with Engineering Fundamentals to understand how flow rate plays in.
There is even math for how much energy need be provided…although sci-hub doesn’t want to give it up right now. https://www.sciencedirect.com/science/article/abs/pii/S0022286010009270
See instead: Thc-A decarboxylation rate (which as a couple of papers linked).