Looks longer than a week.
if you start scoping trichomes too early, you will find mature trichomes, but if the plant isn't near the end, this is misinformation.
The calyxes around the white hairs need to plump, first. then start looking at the trichomes - only on calyxes, not on the leaves.
if you start getting too much fade, do start up the fertilization again. you may have 2 weeks remaining. It's hard to guesstimate accurately.