I received an invite from a friend on PC and accepted it on Bungie.net.
The invite never appeared on my Xbox even overnight.
Now, the friend appears as accepted on Bungie.net but does not appear in the Roster section in game.
So how long does it take for the friend to appear?
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I've found on XBOX it can take a full day for people to show up. It's not a Bungie thing, it's definitely a Microsoft thing.