It's a huge and magnificent dick but to keep a sense of perspective you need to compare it with things you know the size of. The top holds it several times at the beginning of the vid so they'll be the same distance from the camera. He's a lanky guy and his arm will be roughly 10" from his elbow to his wrist on the inside and 12" on the outside. His hand will be about 7" - 8" long and a bit less than 4" across the splayed palm. I'll let others do the calculations.