24:57 (subbed 35 reps on each rounds, subs as follows: 35 lbs. dumbbell swings, tuck jumps for double-unders)
Avg.HR=171, Calories=422
My time keeps going up, but I keep increasing the difficulty, 4" more on the box, knees-to-elbows, 20# wall ball). The knees-to-elbows always kill me. I probably blew 5 minutes on those. Burpees were the second most difficult.