Hi VihreeLinja, schedules aren't set in stone and are set out in " stages of growth ", i.e. seedling, vegetative, flowering stage,etc . You just extend the use of stated nutes for that particular stage, and judge how long to feed for, before changing stage.
All plants differ, even same seeds, depends on phenotype, strain genetics, method and judgment on peek trichome ripeness.🤔
Trichome colour and appearance of plants are best indicators as to when there ready😋
Basically chop when you decide trichomes are to your taste, so don't worry to much about week numbers, there done when there done ......🙂