took my smallest plant and put it in a 55 gal drum at 6pm every night for last 2 weeks and its got marble size buds already, so if you have small plants ,a 55 gal drum or very large platic garbage can would work. not that much trouble to put in can every night, then after dark,take it out and its ready for morning.the rest will do it naturally, but i will be real glad to have one done early.
Just make sure the plants get some air exchange in the dark space. They still want to breathe and transpire moisture.