Rapoport: Derek Carr avoided serious injury but could miss time; Carr has AC joint sprain (Sports Med Dr Jesse Morse predicts 1 - 4 wks)

I don't know. I had this injury as high school tight end and had to miss two weeks and wear a brace the rest of the season. I remember I couldn't lift my hand over my head for at least the first week. Long time ago at a low level but it was pretty painful...