When I did my 1 lap I took about 1.45 in the dry I was pushing myself to my limit (all be it not a high limit) - on the back straight across the field (a grassy gentle climb, bit of a head wind). I was in my granny ring with riders flying past me, more than one asked if I was OK and did I need help, several thought I was doing it solo and gave me encouragement to keep going.
Tips for team riders...
Don't eat within an hour or your lap - especially the pies.
Drink plenty and don't bite off the camel back valve and let your water supply run down your leg 1 mile from the end.
Travel light, you need a spare tube, a pump, a drink and a small multi-tool. You don't need 4 layers of clothing crank extractors a headset spanner and a full socket set.
Don't make Mayhem your 2nd hilly mtb run in 5 years (Glentress was my first 2 weeks earlier)
Do you best not to look like you are having a heart attack with each turn of the pedals.
Don't be tempted with chasing after the young fit ladies that are lapping you, it drains you more, you get delirious and end up chasing a fit bloke with long hair because they look the same in your blurred hallucinogenic state.