Question

How many days or weeks after the first preflowers pop up will the plant really start to flower? I know that it is strain dependant but I want to know when I can expect.

depends on the strain of course. also how you grow it, for instance if you want a short plant ive haerd you can switch the light from 18/6 to 12/12 after only two weeks of veg! if you bought your seeds the company you got them from should have info on an estimation for the flowering time length. good luck.