Aside from password rotation being a very questionable practice, it actually can cause productivity loss. In a big organisation like mine it can take up to 48 hours for a password change to synchronise across all the internal services. There's also the issue where some endpoint software still uses the old password behind the scenes and fails to log in too many times - causing your account to be locked. I guess you can see my frustration coming through.
I had the joy of dealing with some endpoint software like this in an organization that had mandated password changes every 30 days. Very predictably, people set recurring "change your password" reminders for the 1st of the month and the organization lost an entire day of productivity each month as they locked themselves out of their accounts en masse. So the beginning of the month was always a panicked, all-hands-on-deck day for the help desk as people were waiting on hold for hours to get their account unlocked.
