Mature starter readiness indicators

Mature starter readiness indicators

Gurus, does doubling after a feed (build)  in 5-6 hours indicate readiness for bread?  I had an issue w my last loaf getting insufficient lift and think I was sloppy and not paying good attention to that crucial detail:  i.e. starter being fully ready to lift a bread.
Thanks in advance for the answers.

hester

Source: Fresh Loaf