my friend didnt even have an in person interview even though her invitation said "Interview". She arrived in the CIC office and found out that about 40 other people had an appointment for the same time. They had all of them in one room, explained the procedure of checking the data of passports and visas in 2 line ups and whoever had to pay a fee could do that then and there as well... about 30 minutes including waiting and lining up - that was it! No questions no nothing...
btw she had applied as caregiver and her process was very straight forward and quick (1 year all included from sending in the application to the date of the interview/visa issue)