ETAs - when it looks almost bud like (except not shrunk up from drying, which it will shrink significantly), i'd guesstimate 7-14 days. really depends onthe strain. some stuff really ripens fast at the end and others do not.
pistil visible length and coloration
density of buds
trichome coloration
use all three. don't put a time frame to it.... simlpy read and react. the less you think about it the less likely your compulsions impact your behaviour.