I've always thought that conference talks should have the traffic light system that you get a Toastmasters. IIRC it's green while you've still got plenty of ti

I've always thought that conference talks should have the traffic light system that you get a Toastmasters. IIRC it's green while you've still got plenty of time, orange when you're within x minutes of the scheduled end, and red once you're at the scheduled end. I've found (from Toastmasters) that a nice bright light at the back of the hall is much easier to respond to than a clock or something counting down