How do I change the sleep timer setting to save energy?

Press the home button and select Settings > General Settings > Basic Settings > Sleep Timer. Press the + or – button to increase or decrease the number of minutes, or press OK to use the on-screen keypad to enter the number of minutes directly. Select Done when finished. (Page 25)

From the official Epson EcoTank ET-3850U All-in-One Wireless Printer manual, page 25

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