I did it last year on zero training. I did go out on a couple of rides thinking they were training, but it was cold and wet so gave up. They turned from training, to just a couple of short rides.
I managed it in 5 hrs 10mins on a hardtail with 50psi in the tyres. Pretty sure it would have paid to put on softer, bigger tyres as the descents were often steeper and looser than i expected.
Reverb would have helped too…
I was also far from the end of the pack. So im sure you’ll be reet. It was certainly great fun if painful at times!