I cannot figure out when I will be able to return to Canada if I leave the country in December 2020 =(
My visits to Canada were the following:
From 02-Feb-2019 till 16-Feb-2019 (15 days)
From 19-Apr-2019 till 12-May-2019 (24 days)
From 13-Aug-2019 till 20-Oct-2019 (69 days)
From 14-Dec-2019 till 12-Jan-2020 (40 days)
From 9-May-2020 till the day of writing (staying in Canada now while waiting for IRCC Office in Warsaw to complete my application for PR outland)
Can you help me with calculations please?
When can I come to Canada if I leave the country in December 2020 (after getting the extension or while waiting for IRCC to process it)?
I'm not sure I understand what calculation you are asking about.
If you are asking about the 180 days within 365 rule, there is no such rule, it's a myth.
The 180 days is a guideline only. If you have an inland spousal sponsorship application in progress then you should return to Canada as soon as possible and keep your trip outside of Canada short since the inland sponsorship process requires you to be living in Canada.