i think you shud fill it with first the yrs normally r required to complete high school and then it depends on your degree and some ppl complete it early by taking summer courses so you count your degree as per duration of the degree programme ie if it was a 4 yr degree mention only 4 yrs its bcuz if you complete your degree early then your obviously intelligent but if you took longer than normal and got failed in 1 or more semesters then wat...? so i think you shud fill it the normal way. later on when you'll submit your educational documents they get to know exactly wat was you course and how long you took to complete it...