Highly dependent on site traffic and session storage. In the case that sessions are stored for a long time, and all in the form of a file - perhaps a quick clogging of inodes. You need to pay attention to the parameter session.gc_maxlifetime in php.ini.
Sheldon.Fadel74 answered on March 12th 20 at 08:04
Only if you did the php settings and garbage collection have stopped working.
Have in mind that the old / unnecessary files are not deleted.
in the future, you may need to Google "php session files are not deleted"