36 hours of darkness before harvest has absolutely NO measureable effect. That's nothing more than an old hippie myth! If you've followed good growing practices there is no need to attempt tricks --- If you haven't, then no last-minute action is going to make things any better. That's like the forum BS about harvesting before light, which supposedly will increase your potency and the amount of trichomes. I mean come on folks, think about it. Trichomes take WEEKS to develop and fill with resin! That shit doesn't just happen overnight! And light won't degrade your plants THC any appreciable amount in only 12 hours, so harvest whenever the time is right for YOU, because the plant doesn't care about the time of day!. This seems to be one of the most common myths I see on the various MJ boards. You can't correct months of poor growing in 36 hours, nor can you appreciably enhance the results of months of proper growing in 36 hours.
It's all BS.