How many wings did each of the four living creatures have in Revelation 4?

Answer: Six

Each of the four living creatures had six wings and was covered with eyes all around and within.

“And each of the four living creatures had six wings and was covered with eyes all around and within. Day and night they never stop saying: “Holy, Holy, Holy, is the Lord God Almighty, who was and is and is to come!””— Revelation 4:8 (BSB)