regeneration of flowered plants

does any one here know about regenerating plants. what i mean is flowering a plant, cutting it down and putting it back into veg untill it grows back. what ive heard it only takes two weeks or soto grow back, then put it back into flower for the second time .. i know you can take cutting off plants a couple of times but can you do this after flowering .. if so how many time coul d you use the same plant.. hope some one cab help

Im doing my 1st reveg right now,im no expert at it but i can tell you its going to take a lot longer than 3 weeks,it took mine 3 weeks to start showing new growth.

After you harvest all the buds leave a few very small popcorn bud sites untouched on the lower branches,then chop off alot of the old growth branches,you'll then need to take a butcher knife or saw & cut out about half the old root mass & repot in fresh soil,give it some nitrogen once a week & wait it out,the plant will start to reveg in a week or two.