A leisurely walking pace is 4-5mph, so that's about an hour commute. Less after you've done it a few times. If she wanted to use a bike that could be reduced to 20-30 minutes, which is totally reasonable.

That's really inaccurate. 3 mph is fairly brisk (20 minute miles). 5 mph is a 12 minute mile, which is, for many people, a running pace. Were you thinking of kph?

I've been walking to work for over 2 years now. My current commute is a bit over a mile, and it takes me a bit more than 30 minutes. So 5 miles is easily 2 hours, even if you have relatively long legs and walk quickly.

I think you mean 4-5 km/h. 5 miles is a 2 hour leisurely walk, and a very fast march in one hour.

I walk two miles each way every day and it takes me around 45 minutes to an hour to walk the two miles depending on how fast I'm walking. For the round trip it comes to be a bit less than 2 hours.

Is 4-5mph really considered leisurely? I thought the average was around 3mph, I know I feel like I've done proper exercise if I keep 3.5-4mph up for over 30 minutes.