Even before Taylor Swift's highly-anticipated Eras tour began, it had already set records. The first day of pre-sale alone saw almost 2.4 million tickets sold, the highest number for a single day. Industry experts now predict that the tour, spanning 52 nights and 20 cities, will become one of the highest-grossing of all time. Forbes estimates that the singer could earn anywhere between $500 million and $1.5 billion from the tour.