How long does it take for USPS first class international to ship to Canada?

I ordered a yoyo and a few accessories from yoyoexpert and I was wondering how long it usually takes to ship. I live in Toronto, ON canada. i recieved an email telling me it has been shipped. I also recieved an email from USPS saying that it has left and is on its way here. it has been 5 days since i got both emails.