Soil grow veg for about 5 weeks, then 9 weeks flower or something like thatand as for how many, that depends on the way your going to grow them and the size ya want them.....
ThanksHey baz i think ud be safe to take 6 sq.ft.Using the pros techniques of small veg about 8 " and directly to flower. u could fit at least 4 plants/sq.ft.I think thats 24 plants and ud have a killer harvest with that lamp..
My buddy does clones in one gallon bags and harvest about 1/2 per plant from Cutting then placing directly into flower.
Check out al b fucts stuff..Its very helpfull.