The average finish time for a Tough Mudder 5K is 1-2 hours; for Tough Mudder 15K it’s 3.5-4 hours. That said, Tough Mudder 5K and Tough Mudder 15K aren’t timed events, so you can go at your own pace. How long an event will take you depends on your level of fitness, your experience, and whether or not you’ve been training. (Not so much? Check out some training tips and tricks here)!