Also timelines. I don't have first-hand experience, but the people I've talked to said they had citizenship within two years.
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).