Last Saturday the PT said "run 10' on the treadmill at an easy pace." I did and she watched. On Monday I ran another 7' and she filmed. Neither experience was remotely uncomfortable.
She then said "run 3x per week" working on this or that -- cadence, firm hips, long follow-through -- and if it hurts, stops. If it does not hurt, feel free to add more time.
I feel like an East Berliner in 1989.