On the next day, the multitude that stood on the other side of the sea saw that there was no other boat there, except the one in which his disciples had embarked, and that Jesus hadn't entered with his disciples into the boat, but his disciples had gone away alone.
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.