The motors tend to get hot, and heat weakens the magnet, then that causes them to get hotter - and then you have problems. In the past even when practicing/testing I only ran for 5-6 minutes at a time. Things are better now but still I wouldn't be confident to push it - its expensive gear afterall.
Meetings tend to be over subscribed, to extend race duration would mean having to reduce entries and that wouldn't be popular as already people are getting turned away - i.e.Chadderton, Nationals, NW regionals. But then club meetings is a different story - can be down to the clubs own discretion.
