@snail how about speakers who had 15 but then their own staff wave at them early and then end up with 11….. The answer is obviously that these ones are the best ones ;)
@snail I enjoyed going to presentations of both lengths - some 8 minute talks were great as were 20 minute talks. I was one of the 20 minute talks, and my data would not have made sense in 8 minutes, so there may be some bias in my comment.