The FF scedule does fine for seedlings too, 1 month veg time and the rest budding. Are you growing outside or inside?

If inside, how much lighting do you have and what space are you growing in? These are vital variables as to how long you CAN veg for and not waste space. Total grow time is veg time (>14 hrs light) + flower time (~12 hrs light). Most strains should be 7-10 weeks flowering time, and unless you have some sort of high powered HID, 600w & up, and at least 2' x 2' x 5' for each plant I'd say veg for a month max. The plant will seem small, but it grows and stretches rapidly for the first few weeks of flowering, so don't let it get too big or your light will be used innefficiently/insufficiently.

If outside, wait until late May or June to plant unless you can conceal a huge plant.

Remember it's a weed, and if fertilized well, will grow very quickly. 9 months will give you a tree and a huge power bill to get the plant's full potential. It's better to have a smaller plant with dense, full buds than a tree with lots of small popcorn buds that add up to the same, at least IMO. You'll see why when it comes time to harvest & trim