Parts delay in a 2001

I posted last week that I needed to get an exhaust system component replaed to take care of a check engine light. It's been over a week, and after calling the dealer I found out the part is on back order. They can't hazard a guess as to how long it'll take

what has been your experience with this sort of thing in the older Prius? Fortunately the car is driveable, but am I likely looking at waiting a few weeks, a few months, indefinitely?