https://www.polygon.com/2017/9/22/16351914/destiny-2-servers-down-maintenance

Destiny 2’s servers will be down for maintenance on the morning of Monday, Sept. 25, as developer Bungie prepares to release a new patch for the game, the studio announced last night.

Bungie expects it will need five to six hours to perform maintenance, after which it will push Destiny 2’s version 1.0.3 update live.