Forced password changes are one of those security theater exercises that drive me absolutely nuts. It's a huge inconvenience long-term, and drives people to apply tricks (write it on a post-it note, or just keep adding dots, or +1 every time).

Plus, if your password gets stolen, there's a good chance most of the damage has already been done by the time you change the password based on a schedule, so any security benefit is only for preventing long-term access by account hijackers.