What level are u used to doin?
intro and PN are both at 450mpm and novice is 520mpm (and it just gets quicker!!!).
So quite quick if your not used to goin fast!!!
If your later on, time some of the other teams and see whether they are all goin too fast/slow and then ride accordingly (either kick like hell or stay in trot!!!!)
Good luck, there great fun!!!