You will learn to read the buds. Sometimes they need more hang time, sometimes they need the bag, sometimes they are ready for the jar.
The buds themselves, along with enviro conditions will determine dry time.
Ultimately you want to dry as slowly as you can without mold. That isn't a lot of help, but that is what you are aiming for.
Though nothing is really wrong with fast dried stuff, but if you want the best out of it...