quick question

when in weeks should i start turning my lights to 12 hours a day

bubblegum and the lights are now on 24 hours a day but only for another week or week and a half

Quoted straight from the bible:

"You will get the best out of your plant by waiting until it starts pre-flowering before switching to 12/12."

"How long this takes depends on the strain you are growing but after the seedling stage has finished you are looking at a time period of 4 to 8 weeks vegative growth. With Sativa strains this can take much longer."

Of course you don't HAVE to wait that long. In his book SeeMoreBuds forced his Mango to flower at 16 days old.