Canon i-SENSYS MF6140dn User Manual page 706

<Off>
<On>
5
Select secure print delete time using [
Specify a time range for erasing a secure print job waiting for security password input.
You can specify a value between 10 minutes to 240 minutes by the minute.
6
Press [ ] (Menu) to close the menu screen.
7
Restart the machine.
It is necessary to restart the machine to take effect the settings.
Turn OFF the machine and wait for at least 10 seconds before turning it back ON.
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Secure Printing is not available.
Secure Printing is available.
] or [ ] and press [OK].