Work boots - Redback - until they split at the bridge and water gets in - ~4 years. Runners - Asics Trail Running shoes - until the foam in the sole has worn down. 1500km (8km/day dog walking).
Crocks - Until they’re fucked. Had them two years now.
Birkenstocks - Until they’re fucked. Had them six years now. Self replacing the sole was a waste of time for me. I’ll but another pair sometime but I only wear them a few months of the year.