http://www.cic.gc.ca/english/resources/manuals/op/op10-eng.pdf
If someone has already spent 730 days and leave canada and he/she doesn't have PR Card to return or card expired and they are outside canada then embassy will count the days the day they will receive application for travel document.
E.g. One person spent 731 days and left canada without PR cards or expired cards and land in other country thinking that they will get Travel document as he alredy spent 730/731 dayys but that person apply for travel document in embassy after lets say one week or 10 days then the visa officer start counting days the day he received your application, i.e., after 10 days of landing in that country (outside Canada) and when he will do the math, the person who is abroad will be short 10 days. So better you spent 750 days and apply after 10 days and this way he counts you still have 740 days in your defense, i.e., 750-10= 740 days.
If someone has already spent 730 days and leave canada and he/she doesn't have PR Card to return or card expired and they are outside canada then embassy will count the days the day they will receive application for travel document.
E.g. One person spent 731 days and left canada without PR cards or expired cards and land in other country thinking that they will get Travel document as he alredy spent 730/731 dayys but that person apply for travel document in embassy after lets say one week or 10 days then the visa officer start counting days the day he received your application, i.e., after 10 days of landing in that country (outside Canada) and when he will do the math, the person who is abroad will be short 10 days. So better you spent 750 days and apply after 10 days and this way he counts you still have 740 days in your defense, i.e., 750-10= 740 days.