My question is when the trichomes are about 80% cloudy Do you put the plants in 3 hours of darkness Then cut them down? or do you Cut them down then hang them in darkness?

I've heard of people using the 18hrs of light and 6hrs of dark and 20hrs of light and 4hrs of dark which light schedule works best and why? new to autos thanks what would the extra 2hrs of darkness do if running the 18 on 6 off?