It's not necessary. I got the same concern about the required residency days being 720d. I became PR on Oct 28, 2015 and applied for my travel doc on Dec 23,15. I just quit my job too and was out of Canada. However, for the required residency days, I wrote all the days since I came to Canada in 2010. So i had a total of thousands of days although I am technically only been a PR for 1 month or so..... I wrote those days down just so it doesnt complicate things bcos it says there that if u dont meet the required 720d, u have to give more proof etc..... However, my travel doc was issued with no problem, and like Quink said, I dont think the agent even cares abt those days xD just formality