About the "days" thing, the most important thing is to check when the plant is ready, irrespective of how many days the breeder says it will take until it's mature enough to harvest. There is a window of harvest, from just ready to very ripe.
On the "just ready" side of things, you probably want 70% of the pistils to have changed color from white (or pink) to brown / orange, and the trichomes (the little bulbs of crystal) to be changing from clear to cloudy (white).
On the "very mature" side of things, then almost all the pistils will be brown (or fallen off), and the trichomes having maybe 50% cloudy and 50% amber.
The earlier harvest tends to be "higher", whereas the later harvest more "stone".
Often the buds up top and down bottom will have some differences, with the lower buds maybe needing a little more time.
I personally prefer a slightly earlier "high" product, so harvest earlier than most.
But earlier will also mean less weight. Pistils changing to orange / brown doesn't mean that the calyx (the little pointed flower itself) is fully matured in size, as they often bulk up after the pistils have turned and they are no longer viable to seed.
A lot of people will pick a little bud fairly early, fast dry and test, and then wait a little longer, etc.
That's also a good way to maybe stagger your harvest, keep them separate, and test smoke them.
You can find whether an earlier higher flower is better for you, a medium one, or a late matured flower works for you.
Main point, look at your plant, and see when it's ready, and don't worry too much about what day it's on.
Though definitely record what day, if you want to grow that same strain again and need to time things.
You got this, girl!!!