How do I use the Timer function?
Press the Timer button when the unit is powered on or off to set a delay. Use the UP or DOWN arrow to change the delay time in 0.5-hour increments, up to 10 hours. The setting will be confirmed automatically after 5 seconds. To cancel the timer, press and hold the Timer button for 2 seconds.
From the official Frigidaire FFRE053WAE Window-Mounted Room Air Conditioner manual, page 2
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