The only way I can see to do it is go to menu, preferences, and the inactivity. Set it to turn of when you want.
The manual might help if that’s not good enough.
Dish Network Sleep Timer
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Press the Menu button on the remote. Highlight and select Audio Options or System Setup from the Main Menu.Highlight and select Volume Control from the Audio Options menu or Volume Control from the System Setup menu.Highlight and select DISH Receiver Remote Volume Control or TV Remote Volume Control. Highlight and select Save.Press View on the remote to quickly exit the receiver menus