I'm really interested in the amount of paper this art project will use, and how much it'll weigh. He says " a cumulative length of some 5000 miles" but doesn't

I'm really interested in the amount of paper this art project will use, and how much it'll weigh. He says " a cumulative length of some 5000 miles" but doesn't specify the paper so I can't calculate how many trees went into this. I'm not an extreme ecological conservationist, but this does come across as a huge waste for no real purpose.