Of the 3 both me and the wife found scafell the easiest. Nav would be harder than snowdon if it came in but i really enjoyed it.
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Ben Nevis is purportedly the hardest mountain (and highest peak) of the Three Peaks Challenge. That's why people tend to do it first if they're taking the 24 hour challenge.
Ben Nevis is probably slightly harder, but not a great deal, if Snowdon posed no great difficulty, then you should be absolutely fine. One thing to watch out for is how to get off the summit. The top of Ben Nevis is a bit of a plateau, and can be tricky to find the right way off in bad visibility.
Firstly, it's more than a gentle stroll. You need to be reasonably fit before you consider making the ascent, and we wouldn't recommend a Ben Nevis walk for beginners.
How fit do you have to be to do Ben Nevis? Ben Nevis might not be Everest, but it's no joke. Don't forget, this is the highest point of the entire British Isles. You'll need good cardio fitness to keep walking uphill for 6+ hours, and strong legs, core, and upper body to carry your stuff.
Total challenge time generally includes ascending and descending all three mountains. The 24-hour time includes both walking time and travel between the mountains — approximately thirteen hours hillwalking and eleven hours driving. Several timings options are available, depending on your arrival time into Fort William.