It's a good race. The key is to put everything you could possibly need in your pit area before the race – including a chair and a little fishing tent for shelter from the rain/hail/lightening/sun.
The rules are pretty strict on spares etc – it has to be in your pit before the start. You also have to pull into the pits to get a bottle or food.
As for the course – if it's dry it is relentlessly fast. No let up at all. If it's wet (which in the 6 years I've done the race it has never been…) the course is dreadful and needs 1.5" mud tyres. Fingers crossed…
In pairs, 6hrs isn't that long – so go flat out from the start. One lap is essentially a sprint. It might be worth doing 2 laps on the spin if it's dry and the laps are about 30mins as this will save you one min per lap on changeover.