13 The wings of these cherubim extended twenty cubits. They stood on their feet, facing the main hall.a

Read 2 Chronicles 3:13 Using Other Translations

The wings of these cherubims spread themselves forth twenty cubits: and they stood on their feet, and their faces were inward.
The wings of these cherubim extended twenty cubits. The cherubim stood on their feet, facing the nave.
So the wingspan of the two cherubim side by side was 30 feet. They stood on their feet and faced out toward the main room of the Temple.