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If you're fit enough to consider running up, then it wouldn’t take 5hrs each way just walking that’s for sure. Up pyg then down miners took me and my wife 5hrs 30 total. We weren't really going for it, just a normal fair stomp. We could also have been a bit quicker if we weren’t stopping and darting off the track all the way down picking up other people’s rubbish. Note that doesn’t include time for current fascination with queueing and fighting at the top ;)
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Ran up the tourist track, it’s very easy to follow but isn’t very interesting running, but has the advantage that the down is very runnable so it’s fun in that respect.
I’ve walked Crib Goch, would be fine either side, but running solo on the scramble up to and on the ridge would only be a good idea if you’re comfortable on that kind of terrain. It’s not hard, but it’s exposed - and I’m reluctant to recommend it as a run without knowing how comfortable someone is on terrain like that.
Has anyone ever run up Snowdon? I'm heading there in a month, and would love to visit the summit but I don't have the 5 hours each way to burn. Any advice would be appreciated.