Bungie have announced that Destiny 2 will be undergoing scheduled maintenance tomorrow for approximately six hours. During the maintenance period, the game will be offline. The maintenance will begin at 4:00pm GMT / 8:00am PST, and will last until 10:00pm GMT / 2:00pm PST.
If you are still online and playing a game when the maintenance window starts, you’ll have a hour to complete what you’re doing before being booted from the server. That means you can continue to play up to 5:00pm GMT / 9:00am PST.
Bungie state that “No gameplay content or updates will be introduced with this maintenance period,” so its likely to be prep works for upcoming DLC.