In the world championship, this makes more sense. There's a 60-minute numbers event, and a five-minute numbers where you get two attempts of which the best one counts. In National Standard competitions like this one, we get a 15-minute numbers and a 5-minute numbers - it's a bit too similar for my liking.
'Speed numbers' is what this discipline was traditionally called, but that kind of name is discouraged nowadays, because it causes confusion with speed cards (in which speed is what counts). But I really think we should follow the old German example and give the disciplines individual names - "5-minute numbers" sounds so sterile. Let's call it the Numbersprint.
I once held the world record for this discipline, with 333. We've had a 50% improvement in the years since then!