Oracle Idle Timeout

You can find what your Oracle Idle Timeout is set to by:

SQL> select * from dba_profiles
 2  where RESOURCE_NAME = 'IDLE_TIME';
PROFILE                        RESOURCE_NAME                    RESOURCE LIMIT
------------------------------ -------------------------------- -------- ----------------------------------------
DEFAULT                        IDLE_TIME                        KERNEL   4320
SQL>

For details of profiles, see: here