Time frames are not accurate so you was wise to question that. You can most often expect to have some nice looking nugs by the times given.
But these numbers they give cause so many to harvest before there bud is really very ripe…
I’m guessing if there hasn’t been any other issue, they are probably spreading their roots out. If so you will soon look in and be like, dam they grew fast over night!
Some times getting off to a bad start, it can be faster to start over I would say. But it would need to be a really bad start I think 