https://www.gamespot.com/articles/heres-when-fortnites-season-6-server-downtime-begi/1100-6462073/

Season 6 of Fortnite is almost here. The next season of the popular battle royale game kicks off on PS4, Xbox One, PC, Nintendo Switch, and mobile this Thursday, September 27, and it'll arrive alongside the release of the game's 6.0 update. Now developer Epic has revealed what time that patch is scheduled to drop.

On Twitter, Epic announced that Fortnite servers will be taken down at 1 AM PT / 4 AM ET / 9 AM BST while it rolls out the game's 6.0 update. The developer didn't provide an estimate for how long this downtime will last; previous maintenance periods have typically run between one and two hours, though the timing could vary, particularly as patch 6.0 will presumably make some rather significant changes to the game.