OK, so I give you an example. Let's say I've been working full time from April 1 , 2020 to April 1, 2021. However I have 2 weeks that I only worked 20 hours/1 week. So total of hours I got is: 50week x 30 + 2 week x 20 = 1540h
So I need to work another 20 hours after April 1,2021 to make up 1560...