Mine is somewhere between 30 and 50 days (been keeping track and it seems to shift around). For a while a bunch of us were able to get them to stop expiring our passwords, until upper management found out and put a stop to it.

The counter on my password is somewhere up in the 50s or 60s. (For those of us on linux, it's only used for wifi access - things like email and svn use a different, non-expiring password)