Can I change my visa status from visitor to student after arriving Canada? (stud

[nozomi0530]

So, I'm from Japan and I'd like to apply for a study permit in US because I've heard that it's sooner. It takes more than 3 weeks to apply from Japan. So I think I'll go to Canada once, and then go to US and I'll stay there to apply for study permit and go back to Canada. But is it possible? How long does it take actually? THANK YOU SO MUCH!!