Depends on who's takin. Friends or fam...its all about how fast you take Big Cottonwood. Its a dangerous canyon, but is usually safe. So I'd say about 30 mins. If its a bus, then you have to stop at all the stops that people are at and when people request to stop, then usually a little over an hour. My house is less than 5 miles away from the mouth, so about 20ish miles up the canyon. But it climbs to over 8,000 feet which is about what twice the Salt Lake Valley is.