There are no set in stone timeliness, you need to transition at a pace you are comfortable with, genetics and age play a large part in how well your body responds to hormones.
Facial hair removal takes a long time and can cost as much as GCS, i had one year of laser sessions, they took care of the dark hairs but left the white/gray ones, so far i have had over two years and 100 hours of electrolysis, total for both so far is around 13k, i have about another year of shorter visits to completely clear my facial and neck hair, total spent on everything for my GCS was right around 20k i know people that have had 400 - 500 hours of electrolysis, it all depends on how hairy you are.
I fully transitioned in three years, this includes GCS, i know some who did it in eighteen months and others that took four or more years.
This is not a race where you sprint to the end it is a marathon so you need to pace yourself.
Paula