Lexmark 3455 - Manual (Page 118)

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3. Now select Tuning options.
The Job Interval Shutdown Timer indicates the number of seconds PSF/2 waits before
shutting down when there are no jobs in the queue. In other words this is the amount of
time that PSF/2 remains active after the last job is printed.
Valid values: integers 1 to 9999
1-9998 time in seconds to wait between jobs
9999 wait indefinitely for the next job to be received.
If you are using a MarkNet internal print server and set the printer IPDS Timeout
value to Host Controlled, the recommended value is 30 seconds.