A 5K is 3.1 miles. If you walk it briskly, you can do it in 50-60 minutes. If you run/jog it, it could take you as little … as 35 minutes.------------------------------------------------------------------ I've done a 5k before, a 5k is 3.1 miles.I've only done it once and it took me 28 minutes and 45 seconds.f you're talking about the actual time it takes to physically run a 5k (and not how long it would take to train for one), it's about 30 minutes.