We had people do this. It sounds good in theory but in practice you wind up scheduling the next meeting 45 minutes later because you know the first one will run over.
The second or third time the “boss” rolls into a meeting 30 minutes late, you go look at his calendar and realise somebody scheduled a 1 hour session as a 15 minute catch-up.
Meeting discipline is also needed for 15 min meetings to work! This and good estimation skills. Ideally meetings would be planning things in advance that scheduling a follow up isn’t the end of the world.
The second or third time the “boss” rolls into a meeting 30 minutes late, you go look at his calendar and realise somebody scheduled a 1 hour session as a 15 minute catch-up.