How many days after the main forces commanded by Aleksei Shein started to advance towards Azov did Peter I and his galley fleet leave for Azov?
return the  main forces commanded by Aleksei Shein started to advance towards Azov  ;return Peter I and  his galley fleet did leave for Azov  ;return when  was  #1 ;return when  was  #2 ;return difference of #3 and  #4 in  days
['select', 'select', 'project', 'project', 'arithmetic']