The default limit is usually 15 minutes, but after a short period of complying with YouTube policies (no copyright infringement) you can later upgrade (for free) to up to 10 hours per video.

To learn how to increase your upload limit, please review the "Increase your limit" webpage of YouTube. Additionally, we strongly encourage you to review the Terms of Service of YouTube before uploading any video.


 

Source: https://www.youtube.com/upload