I don't think it's how long it is that is difficult it's how steep it is It is very steep I would say it's close to vertical in a couple spots on the way up!
I believe it's 0.7 miles from the base to the top, so 1.4 miles round-trip. The first half is a pretty decent incline though. Old pavement until the very top.
Less than a mile to the top.
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