Immediately after those days -
those days - jumps ahead in time to the sees the signs from heaven and earth generation
Jesus told His generation that the signs from heaven were not in their time.
His generation would only see the sign of Jonas.
Jesus also foreltold how times would come first as to be ye not troubled as the end was not nigh.
It would take a very very long time to get to the beginning of sorrows time of nation against nation.