In reply to kyle_wilson01:
The winners will run most of the time (except for up hill). Many, especially in the lower classes, will not run at all. In my first event (LAMM), we did the C class and got into the chasing start, despite doing no running at all - the clag was down and our navigation was good.
40km will be for the whole weekend, and probably straight-line distance rather than optimum route. 8 hours will be the winning time for the whole weekend. For an idea of how most people do, check previous years' results
http://www.theomm.com/event-series/omm/the-omm-results