How long since fuzz at nodes became more than a couple pistils barely showing from immature calyxes?
about 2 weeks from that point, give or take. Is this an auto? If photoperiod, more precisely 21+ days from the day you changed the light schedule.
If it continues to stretch beyond 21-28 days, it could be normal, i guess, for a longer bloom period strain, but it could also be due to a light leak too. Cover your bases.