Hey I am back from England!
The Dawn to Dusk Enduro was the first 12h Race I did and I can tell you it is worth it!
They made a 13 mile track with everything you like to have, fast country roads, steep inclines, downhills, rough areas with rocks and so on.
The ground was very rocky, because the area is a shale stone quarry. Unusually we had very good weather and it was a lot of fun riding there.