How much play/slop in IWE is ok?

[2011Expelimited]

2011 Expedition Limited, 160k miles
I notice that I have about 5-10 degrees rotation of play/slop in the IWE on my Expedition, seems about the same on both sides. No grinding/partial engagement issues/noises. Was just in there inspecting the brakes and noticed I could rotate the hub about that much before the axle moves...
How much play is acceptable??

Everything I've found online centers around engagement issues, and not rotational play.

Thanks!

 

[S20Workstation4]

The hub should be able to move about 30 to 35 degrees in each direction, before it starts to turn the axle.
As long as there's no grinding issues, then you are fine.