Mobility work should not cause limping temporary or not.
If it feels sketchy it is sketchy and you shouldn’t continue doing it.
If you know you are doing something for too long then why are you holding it so long?
Pain is your body’s way of telling you something is wrong.
Breaking the time spent into shorter time with more exposures is a way to start.
For example 4x:30 with :15 break between moving to 3X:45, 2X 1:00 etc.
As time passes you may not be maintaining a good position which may be why you see other things showing up when doing a mob for 1 longer exposure.