That black and white pole you saw today is 31 lengths from the finish, in honor of Secretariat. That’s his margin of victory.
Here’s an amazing thing to consider...Secretariat ran the Belmont in 2:24 flat (still the world record for 1 1/2 miles). Justify ran the Belmont today at 2:28.18. Justify would have finished more than 24 lengths back of Secretariat - he literally would not have been in the TV screen shot when Secretariat crossed the finish...he wouldn’t even have been close to being in the screen shot.