You need 1950 hours of work for a year. If you have that, no probs. Otherwise, I don't think they look too closely. If you say you worked for company X for 4 years full time and they verify with a letter without mentioning that you took 6 months off during that period, who's to know? Besides, 6 months it not that much in 4 years. Many countries in Europe have 6 weeks vacation per year. Be prepared that you will not be seeing something like that in Canada.