Keeping it at 15

20 minutes would feel far tool long on a training session like todays, form would break down very fast and an injury will likely occur. But with the turkish getup 15 minutes is plenty of work, especially when it is coupled with the squat.

Training:
5 turkish getups left arm
5 turkish getups right arm
10 squats
Max rounds in 15 minutes

MHT training:
100 squats
Run 400 meters
75 squats
Run 400 meters
50 squats
Run 400 meters
25 squats
Run 400 meters

Scale as needed, either cut all the squats reps in half and ending with 15 squats or cut them by 3/4, but leave the run the same do not sclae that back.