I broke this down in another comment, but trusting Runner's World for a calorie calculator, a half marathon would take me 2080 calories (at 210 lbs). So a little bit less than that.

Average calorie burn was 830 calories/hour, which they say is equivalent to me running at an 11:30 minutes/mile pace.

In terms of effort expended, important to note that this was three sessions over the course of the evening, adding up to 1900 calories and 2 hours 17 minutes.

So it was something like running 4 miles 3 times with an hour and change break in between, which is probably an easier feat than doing it in one shot.

My arms are still sore and I don't plan on doing that every day, but it was definitely a workout.