Don't work for the food which perishes, but for the food which remains to eternal life, which the Son of Man will give to you. For God the Father has sealed him."
An undetermined period of time. We don't know how long it was after, but John takes us back up to the Sea of Galilee now. He's left Jerusalem, what events others there transpired, we don't know, but back in the area of the Galilee.