I've found that 91% ISO evaps fully in just 3 hours, provided you keep a fan on it and stir it up a few times. I'd imagine most other solvents would take a bit longer than that. Go until there's no smell and then little longer just to be safe.
Okey.. yes maybe a very good ide!! Well I smoked one cone yesterday after just 4 hours drying, and I didnt notice any acetone. But of course I dont want to smoke any acetone.. so next time I make changa I will leave it longer for sure.
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