4.5 miles each way. I climbed in September on a clear day after several feet of snow earlier that week. I'm physically fit but a novice hiker and it took me 11 hours.
I've seen round-trip durations between 7-12 hours. It took us about 11 hours round-trip in a group of two. All depends on hiking skill and group size. Sidenote, it's around an 8 mile hike round-trip
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