I think it has to be a period of 12 months and 1560 hours?
My situation:
March 21st, 2016 - November 4th, 2016: NOC code B - 37.5 hours per week (total hours = 1200)
November 5th, 2016 - January 2nd, 2017: Break in employment
January 3rd, 2017 - Present: NOC code B (same role, different...