To professional male runners in the world - it takes something like 69-72 minutes (1:09-1:12 hours); and to professional female runners it takes like 77-83 mintes (1:17-1:23 hours).
If you are arunner that run only for fun, every result under 2 hours is good.
If you are a -little-bit competitive runner, a result of under 1:30 hours (for male) of under 1:50 hours (for female) is good.
and if you are an olympic runner - ask your coach about it, why do you ask me!?
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Depends on a lot of things, how fit you are, how hard you're trying, where you're riding, what bike you're using and so on.
On easily ridden roads, a pack of racers could do it in 30 minutes. I'd need about one hour. Some may need more.
That depends on your speed, but I think I'd use a bit less than an hour. Though, I go skiing on a pro basis several times a week. Normal sunday-walks with the family will probably take about 2 hours.