Should I wait to flip?

relative to typical height of ac infinity tent, unless you do some more training to limit height, you probably need to flip soon. You have to visualize 4+ weeks of growth to guesstimate size. They keep growing faster over time before the ramp-down and full shift to flower production - which takes 4+ weeks from flip to occur. Maybe a super fast 45 day flower time is done slightly before that... and i've seen plants continue to eke out growth through FD 42, give or take. fill about about half the space (LxW 70% x 70% = 49%). They will easily fill it in even if only 2x stretchers, which is on the small side. Plenty of vege growth remains after flip (vegetative growth = new leaves + stem elongation, not speaking of "phase")