This may seem like a dumb question, but when I try to upload a video to YouTube that is longer than 20 minutes it says the video is too long. How do you get past this, because I see many YouTube videos that are over an hour long. Please help

You need to be verified, unfortunately. I would recommend splitting it up in multiple parts.

But how come I see YouTube videos on this site that are over an hour long or longer?

All you need is to have phone verification.