Then yes, to me 1 hour, stirring the mix every 10 mn...is IMHO enough (I do it with Everclear, so with 151, maybe 90 mn as it is a little less strong??)
Nop, that's the concept: alcohol evaporates, not thc. So if you've got 91 alcohol: it's more or less: 90% ethanol /10% water. You can...