question: How many months passsed between Cox outlining his plan to Governor Macquarie and Macquarie's report to Bathurst?
#1 return Cox outlining his plan to Governor Macquarie 
#2 return Macquarie 's report to Bathurst 
#3 return when  was  #1 
#4 return when  was  #2 
#5 return difference of #3 and  #4 in  months