Upvote:3
This Canada Immigration FAQ page from April 7, 2022, says:
How long can I stay in Canada as a visitor?
...
Most visitors can stay for up to 6 months in Canada.
If you’re allowed to enter Canada, the border services officer may allow you to stay for less or more than 6 months.
• If so, they’ll put the date you need to leave by in your passport. They might also give you a document.
•If you don’t get a stamp in your passport, you can stay for 6 months from the day you entered Canada or until your passport expires, whichever comes first.
...
Thus: because you didn't get a stamp in your passport upon entering Canada, you are authorized to stay for 6 months or until your passport expires, whichever comes first.