There was a run/race on last weekend as I was there watching them go far too fast 😉
If they use the same course they might have left it signed and taped up but I doubt it as all and sundry will be ruining it.
Because of that I’d probably not bother as it won’t use much if any of the regular trails and finding your way around will be more hassle than it’s worth as there are paths and routes everywhere around the chase.
If you know the course or can meet somebody who does it may be a different thing but, even then the weather can change it significantly so I’d not be too fussed with the distance being that great.
Edit, Just seen the 6 hours bit. Apart from it being mad, just how much difference can knowing the course a little better be on a 10K route. After a couple of laps you’ll have it sussed and still have time to progress in the race. I’d chance it and take a couple of sets of tyres for dry / wet instead.