here is a race report from some years ago .. so you can see some data .. so 2 sub 29 .. but a number of others in the squad who ran sub 30 .. sub 31 .. 32 ..33 .. 34 .. 35 .. etc
https://www.time-to-run.com/images/race.report.jpg
https://www.time-to-run.com/images/race.report.jpg