According to the TWAB, Destiny 2 Lightfall maintenance will last 24 hours. Destiny 2 Lightfall will be released before the Destiny 2 Season 20 release date.
The download file will be large, but this new installation will decrease load times, and overall disk space usage will be reduced thereafter, according to the article.
Guardians should plan to complete all outstanding Destiny 2 season 19 objectives before the scheduled maintenance downtime, starting on February 27 at 9 am PST / 12 pm EST / 5 pm UTC. While Bungie has not explicitly stated why the game requires this downtime, moving the game entirely offline ensures the team can test for bugs while moving its test build to live Destiny 2 servers.
Bungie's scheduled downtime comes despite concerns that the game's architecture may be upgrading. DLC launches are often rocky, with some players struggling to access the servers even hours after the scheduled DLC launch. Further, recent reports of various error codes and players reporting lost progress toward Triumphs have made some question whether the entire Destiny 2 infrastructure needs to be overhauled to best support the popular live-service space game.
Bungie may take a year off from Destiny 2 following the release of the current Destiny storyline, which will be part of a DLC called The Final Shape in 2024, according to an unconfirmed leak.
Light bearers have just a few weeks left to complete outstanding tasks in the Season of the Seraph. If you have yet to discover everything this season offers, you have only a few weeks left to complete the Destiny 2 Revision Zero exotic quest and earn its catalysts before the next season. Also, check out our recent interview with Bungie narrative team members who provided insightful information about The Witness's role in the game.