How many times did Elijah stretch himself out over the widow's son?

Answer: Three times

Elijah stretched himself out over the child three times and cried out to the Lord, and the boy's life returned.

“Then he stretched himself out over the child three times and cried out to the LORD, “O LORD my God, please let this boy’s life return to him!””— 1 Kings 17:21 (BSB)