Time cycle

Flower now. With a scrog net, because you're going to need it to keep your plant out of your light fixture. ✌️

For normal sized tents and also most rooms I guess 8 weeks is way to long in vegetation. Thins thing will become huge. You will probably going to have to tie the stems down as normally as stated before in the answer most strains will at least double in height during flowering stage. Or you might maybe top the plant and make clones out of the cutlings. Would be my way to go. Either way changing light cycle is suggested as soon as possible😅🙂👍

now :) shes gonna fill that tent allright :)

It depends entirely on how big you want your plant. Once you set it to start it's flower period it'll begin to stretch.. Expect it to at least double its height, so you should take that into consideration. - Like, if you have 150 cm to the lamp, starting flower at 100cm isn't a good idea, as it will more than likely reach above the lamp. In that case, starting at max 70cm would be preferable in my opinion.