Ouch. 15 minutes is the rule. 30 minutes is way too long. I was in only one team that followed the rule, and after 15 minutes people would start leaving the roo

Ouch. 15 minutes is the rule. 30 minutes is way too long. I was in only one team that followed the rule, and after 15 minutes people would start leaving the room regardless of whether others are talking. If someone had a habit of speaking too much, he was coached. When we were on site, we would try to schedule the room such that someone else had a booking at the 15 minute mark - so you had no choice but to keep it in that window.