PUP is 4 weeks now.
I believe Reich or Ballard had said week 6 at one point(even if just throwing out random week), when asked about when be would play, but said if they kept him on PUP he wouldn't be able to practice. This way he is still able to get reps in.
I'm not too worried about it, clearly want him out on the field. When the time is right, he should be ready and up to speed being able to practice the whole time.