IMM0008 Generic Q#12 regarding Education

I am about to apply for CEC class,I have a querry regarding education section in the form Generic IMM0008,which says, "How many years of formal education do you have"? I have a lot of confusion about that, I completed my 3 yrs General degree from canada in 4.5 yrs,actually I changed my program of study thats why it took me long, I came for honours but unfortunately I only did 3 yrs General degree,it is after GCE A levels,Do I have to write the number of yrs I studied in order to complete my degree extra time (4.5 yrs) or I count 3 yrs (actual time) for the degree.I appreciate a prompt reply.
and what is the meaning of Formal Eduication do I include sec and primary education years also.