I sure someone else can answer this with more accuracy than me but I will give it a stab
ideally your looking for 100% cloudy and maybe some amber 20%
in my experience
rarely some plants don't turn amber or at least not within a time frame im willing to except
I grew an ak47 well over a decade ago
the pheno/mother I kept was a huge yielder
at the time I had less experience and didn't realize the pheno I kept, cloned and grew out in large numbers was a very sativa leaning phenotype
had I picked a different mother from the pack it may have finished sooner
its like have 6 children... there not all going to end up being the same height and weight
seeds are no different ..even if there from the same genotype (same mother and father) it doesn't mean they'll be the same phenotype (share all the same characteristics)
from seed to seed they don't grow as identical twins
each seed has its own traits past down from its parents, grand parents, and great grand parents on both sides (male and female)
I let it run 13 weeks and still no amber but it was cloudy at 11 weeks
on the other hand ive grown some others that went heavy amber in 8 weeks
more amber is more of a body stone
don't quote me here as im not 100% on the science
I think
as the plant ripens the thc converts into other things like cbd or whatever
so early harvest might give a higher thc more up high (happy happy joy) while let it go longer and the thc converts and the high gets more sedative or sleepy
having said that
there is also no benefit to letting it go on and on past its ideal maturity
what I do when growing a new strain (aside from watching the trichs)
I harvest 1 cola at 8 weeks, another at 9, and again at 10
label each and when the time comes I smoke them
sometimes the pot is just as good at 8 weeks as it is at 10