question: How many days after King George II authorised the Admiralty Board to seek maritime reprisals against Spain did Vice Admiral Edward Vernon and a fleet of warships departed Britain?
#1 return King George II authorised the  Admiralty Board to seek maritime reprisals against Spain 
#2 return Vice Admiral Edward Vernon and  a fleet of warships departed Britain 
#3 return day of #1 
#4 return day of #2 
#5 return the  difference of #4 and  #3