/AUTOMOUNT[=INACTIVITY:time]

    Optional. Defaults:

    o  If you omit this qualifier, automounting is not enabled for
       this file system.

    o  If you include the /AUTOMOUNT qualifier but omit the
       INACTIVITY keyword, file systems are automatically dismounted
       after five minutes of inactivity.

    This qualifier enables automounting for the file system. The file
    system is automatically mounted when you access its path name.

    You can include the optional INACTIVITY keyword to specify the
    number of minutes of inactivity before automatically dismounting
    the file system. Be sure to specify the time as hh:mm:ss. When
    this inactive period expires, the NFS client dismounts the path
    name.