When Brock Lesnar squares off against Roman Reigns in the main event at WrestleMania 31 on Sunday, there will likely be body slams, takedowns and suplexes.

Recent Wall Street Journal studies found only about 11 minutes of action in an NFL game and about 18 minutes of action in a Major League Baseball game. So we wondered: How much actual wrestling is there at WrestleMania?

We...