The passwords for the UTokyo Account has an expiration date, and the same password can be used for one year. You will not be able to log in to the ECCS services after the expiration date.
Make sure to change your password on a regular basis. The expiration date will be extended another one year from the date that the password is changed. For details on how to check the expiration date, please go to "Password change menu" after logging in to the "User Menu" of UTokyo Account page.
After the expiration date, you will not be able to use the ECCS terminals, etc. However, you can use it as usual by changing the password. Please check the UTokyo Account page for details on how to change your UTokyo Account password.