In Arachin daf 13 it says that it took 7 years for the Jews to conquer the land of Israel and 7 years to divide it (in the days of Yehoshua). From what I understand they divided the land through a lottery system. So, what exactly took 7 years? If the land was already conquered couldn't they just get their assigned portion and go live there? What did they do over that 7 year period?