For most riders, on average, climbs like the Horsehoe Pass will be a good 25-30 minute climb. Some people travelling to the event will not have access to that sort of climb beforehand so it will be important to get on the turbo trainers and replicate that type of effort. Your turbo session might include slightly bigger gears, over the distances people’s cadence is going to drop maybe 50-60 rbm and it’s about how to replicate that type of effort.
If you have got the climbs, it’s crucial to be training on them, using the gears correctly, judging your pace. Going back to fuelling, as soon as you’re at the top of the climb and it’s safe to do so start eating and drinking straight away to replace what you’ve used.