Wow - that's a long distance. Since that's obviously a ton of running/walking, let's say that 5 hours of cardio, while 1 hour maybe during pauses, standing, rest, etc.. I'll say 1,000 reps for a start since this is a unique activity to try to gauge, but the distance makes sense for the sport and is quite legit.

For the next time, please estimate the amount of time you're physically running/walking out of the total hours you played, which would probably be the best way to count it going forward.