I've tried to suggest what people are suggesting here to google (start 10 min late). I'll post it here in case google cal eng are present.

Speedy Meetings, meet Tardy Meetings. I want 50 minute meetings & time to transition, but our culture of "let's wait a few minutes for people to arrive" is way too deeply engrained at my company to shift it. Solution: Speedy Meetings, but instead of end 5/10m early, start 5/10m late. We could turn this on company wide without a revolt.

Alright google cal eng: Go get that promo!