How quickly can i harvest?

I started 4 plants indoors about two and a half weeks ago and want to harvest as FAST as possible, even if that means a smaller crop. Is this possible in 4 weeks? The plants are doing very well and i will try to post pictures as soon as i can. thanks.

veg time is how big you want your plant but flower time still depends on strain.

No... no matter what you do that is not possible...plants need time for veg then ATLEAST 2 months for flowering.... then time to harvest and a few weeks to cure... shortest time to grow a plant from start to finish is mabe 3 months but if you havent even started flowering there is no chance

If you plants are clone they are already mature. If they are from seed you will want they to veg atleast 3 weeks if not a month.