question: Which party had a single period in office for the longest, Democratic Labour Party or Barbados Labour Party?
#1 return Democratic Labour  Party 
#2 return Barbados Labour  Party 
#3 return single period in  office of #1 
#4 return single period in  office of #2 
#5 return how long was  #3 
#6 return how long was  #4 
#7 return which is the  highest of #5 ,  #6