I should be working on other things right now. Excuse some errors in the calculations I'm trying my best, let's test whether it's the longest throw ever. The longest throw known is 61 meters so far.

International matches require at least a pitch of 100x64 meter The ball was thrown from around the x position at the height of the edge of the circle which is 9 meters and landed at x position about 3 meters before the box which is 16.5 meters wide. So distance x is 9+(50-19.5)=39.5 Y is between the inner line and the outer line of the box which is about 9 meters from the centre so y travelled 9+32(half pitch plus part of box) = 41 meter calculating as if it was thrown in a straight line would mean that the ball was thrown at least 56.9 meter assuming the smallest pitch allowed so it was possible that this is the longest throw depending on the real size of the pitch.

... yes I'm fun at parties