That sounds way too short. Until a few years ago you needed to be a resident (=reside) three years before you can apply (which takes about another year). I think now it's four + application processing time.
You also need to actually be in Canada all those days. Any day that you're outside delays your citizenship by a day.
Then it takes about a year to process your citizenship application.
Overall, it's still much faster than most anywhere else.
I think it's more like every day that you are physically present in Canada pre-PR counts as 0.5 days. There's no such thing as a "tourist" under Canadian immigration law: you get a temporary resident visa/status/permit for your temporary "tourist" visits.
I think the part-day test applies (if you arrive in Canada at 10PM, even though you were only present for 2 hours, it counts as a half day).