Our fathers ate the manna in the wilderness. As it is written, 'He gave them bread out of heaven{Greek and Hebrew use the same word for "heaven", "the heavens", "the sky", and "the air".} to eat.'"
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.