We start the meeting at 2 minutes past. Meetings end at 10 minutes before the hour (or half hour) - yes, "30 minute" meetings are only effecitvely 18 minutes, but we leave a few minutes of buffer.
Any meeting that goes over an hour has a mandatory 10 minute break at the 50 minute mark every hour.
If you're not on time..tough sh*t we're starting without you. Use the AI minutes or something to catch up.