Thanks for the information.
I will arrive at YYZ at 12:25 (on AC) and my connecting flight to LAS leaves at 20:25 (also AC). Should be more than enough time to make the connection
A friend of mine lives in Toronto so I wanted to go downtown for a couple of hours. Therefore I was not sure if I better ask to get my baggage labeled to YYZ only, take it to the check-in and get it checked to LAS.