HT-S5910 - Sleep Timer

You can allow the unit to enter standby automatically when the specified time has elapsed.

Press SLEEP button on the remote controller to select the time from "30 min", "60 min" and "90 min".

"Off": The unit does not automatically enter standby mode.

You can also set this by pressing the button on the remote controller and selecting "5. Hardware" - "Power Management" - "Sleep Timer" on the Setup menu.