I get what OP is saying.....I did a couple seedlings and kicked them into 12/12. One was 1 week and other at 2 weeks from seed.
They took longer to finish when counting days from 12/12. A dinafem blue hash took 10 weeks to go all cloudy and I think breeder says it is a 8-9week can't remember but a incredible high and others agree.
Other one was Blueberry-bubblegum(g-13) was a dud, Didn't like the bud structure and was full of hairs and hardly any trichs.................. not good. But that was just one freebie seed so don't base a opinion off mine. Took her at week 8 cause I hated it and needed room for better.
Clones are mature mostly and they seem to finish faster than from seed is what I have learned.