How long does mail take to deliver from Toronto to New York City?

My friend sent me a package (a print), from Toronto. He paid $10 postage. He said he mailed it out September 3rd. It's already September 22nd. Should i say it's lost in the mail, or wait it out a little more?How long does mail take to deliver from Toronto to New York City?
one week to mail take to deliver from Toronto to New York City..How long does mail take to deliver from Toronto to New York City?
It was mailed before September 11 so you will have to wait a little more.

If possible, try and track it if they opted for delivery confirmation.