Fortnite: Battle Royale was made in two months and almost wasn't free-to-play

Fortnite’s Battle Royale mode was developed in just two months, and was originally planned to be part of Save the World, meaning it would not have been free-to-play.

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The news comes from Epic’s head of publishing Ed Zobrist, speaking at a GDC panel yesterday (via PC Gamer). 

"We started working on this just about the time Save the World was coming out," says Zobrist. "So let's do some math: Save the World, the PvE game, launched July 21. [Battle Royale] comes out September 26."

from
https://www.pcgamesn.com/fortnite/fortnite-battle-royale-development-time