It depends on your system but you can change it in you php configuration. In php.ini search for session.gc_maxlifetime() values are in seconds and usually by default is 1440 seconds (24 minutes). Is not wise, secure, good, etc to have a lifetime session, but is your call.
I don’t know if SuiteCRM handles session apart from php, some systems do.
Since after entering the system, I leave my browser, that is to say immediately close the browser and open it and access my directory and the application CRM asks me the password again and tells me that my session has expired …