Well at least they can be specific in terms of duration but have given a vague statement from which one can conclude even more than one week can be considered as not a short holidays
"Sponsors who maintain a principal residence in Canada are not considered to be in violation of residency requirements if they:
- take short holidays or business trips outside Canada on a temporary basis
- have work arrangements that require them to be outside Canada for temporary finite periods of time, but return to live in Canada in between assignments (such as ship crew or seasonal workers)
Persons who do not maintain a principal residence in Canada and who live and work abroad and only return to Canada for short visits are not considered to meet residency requirements."