Didn't notice any patch notes on this, but I have noticed that the way this used to work is that it would take people and not despawn until the caster of the item took the portal, or 30 seconds. Whichever happened first.
Was recently changed to where it despawns after one person no matter what, caster or not. Was wondering if its possible to change it back to the way it used to work? Was a really convenient way to get to guild hall however now it takes an extremely long time to get back to GH at 10 seconds a cast per person if you box 6-12 characters. Considering how fast travel is in every other form (fairy teleporters and such) it seems to fit with the servers scheme to allow speedy GH travel.