It can be changed.
The session expiration time can be selected from 12 hours, 3 days, 7 days, 30 days, or 90 days.
Refer to the below for operation methods.
Setting the session expiration time (Web browser)
https://teachme.jp/8/manuals/30549046
Related: What is Session Management?
https://help.teachme.jp/hc/en-us/articles/900006443883