I have cfl's above the seedlings in the mornings and evenings, also have 2 1000 watt hps for flowering, just needed to know if I was wasting my time putting them near a window for a few hours a day. Some of these seedlings may be picked for my 1st outdoor grow, but I have some "outdoor seeds" waiting to be germed.
3 or 4 hours, maybe five if I'm on top of things, the sun moves along the floor, sometimes I move the plants along with it.