That's all in less than 24 hours of availability.
In less than a day, Fortnite on the Nintendo Switch has already accrued 2 million downloads. "Fortnite’s launch went extremely well," Nintendo of America Presdient Reggie Fils-Aime shared in an interview with Polygon, "we had more than 2 million downloads in less than 24 hours."
Fortnite is free-to-play, which can put into context the sheer willingness of so many to download the game. Nintendo World Report staff were no exception, as you can see from our latest video coverage of their in-game antics: