Minimum times

Is there a minimum time to grow cannabis plants? i need to grow them pretty fast so can you just harvest early and get less? or is there no THC on the plants untill a certain time?

I think that unless the trichomes are milky white/amber you just won't get any high or stoned

once you have a few sets of true leaves, meaning you have a couple of nodes you can at any time begin the flowering stage with the proper lighting cycle. You will have significantly cut down on the amount of harvest by vegging for a few weeks opposed to a few months but it can be done. However, I'm unaware of any way to cut down on the flowering stage. I believe the plant just has to take it's course from when you change lighting to 12/12