Lots of conjecture out there and much of it is correct about Justin Herbert's injury. I was told I could give out this information once it started leaking out. I waited until it more than leaked but anyway...
Herbert fractured his left (non-throwing) clavicle and is undergoing plate fixation surgery today. The recovery time is quite variable but generally at his age and physical condition less than six weeks to return is very possible.
So, assuming his recovery is normal, a return by the Arizona game on November 18th is something very reasonable to consider, especially with the bye week before that game. If he is early with his recovery Washington on November 4th is possible, but I think that is unlikely.
Regardless, we wish Justin Herbert the speediest of recoveries, and for Taylor Alie and Braxton Burmeister to do well in his absence.