LoafTime works out feeding times, rise times and bake plans from a fermentation model checked against published figures from several bakers (each tool lists its sources). Every starter, flour and kitchen is different: a time is an estimate, and the range around it is where most bakes fall, not a promise.
Watch the dough: when it looks ready, it is ready, whatever the clock says. The app says so on every step and lets you mark a step early or late.