What does the Power Freeze function do and how long does it stay on?

The Power Freeze function substantially speeds up the freezer compressor, causing the freezer to cool down rapidly — it is useful for quick freezing items, making large quantities of ice, or rapidly cooling a freezer that has warmed up. Press the Power Freeze button to activate it, and the Power Freeze icon will light up. Power Freeze turns off automatically after 2½ hours to decrease energy consumption, or you can turn it off manually by pressing the button again. (Page 3)