Since the Spatial Node in the Emerald Falls City was set and the "Raid on the Corrupt Path lair" performance was finished, Wu Long was able to return for dinner and rest of the night to the Dream Realm.
Though it wasn't immediate, as he came to settle a few things in the Silver Wing City first.
Although Soft Meadow Continent and Emerald Falls Continent had slightly different day and night cycles. When it was already sunset in the Wei Dynasty capital, Silver Wing City was still brightly lit by the late afternoon - early evening sun.
Synchronizing the timelines of the outside world would only grow more complicated as they would set up Spatial Nodes in more locations, not to mention Worlds where the day and night cycle was longer or shorter than usual.
