I went there 3yrs ago, and got visa within the same day.

Not sure if it's still the same, but to be safe, you may want to stay there for at least one more day. Plus, Calgary is very close to the Banff National Park(about an hour's drive). You may plan a trip there. It's very very beautiful there. You will regret if you went to Calgary but didn't visit the park. :)

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