How many days do you recommend for a city trip to Toronto?

I’m thinking about visiting Toronto for the first time and I’m wondering how many days you would recommend for a city trip there.

I’ve never traveled outside Europe before and will be alone, so I’m also trying to figure out whether Toronto is a good destination for a first long-distance trip. I enjoy exploring cities, sightseeing, and just walking around different neighborhoods.

How long would you stay in Toronto to experience the city without feeling rushed? And are there any things first-time visitors from Europe should keep in mind?