According to Google's Photo and video upload size options
You can upload an unlimited number of videos that are less than 15
minutes long and 1080p or lower resolution. Videos longer than 15
minutes long, or taken at a higher resolution than 1080p, will count
against your Google Drive storage quota. Learn more about Google Drive
Since you can now connect your G+ and YouTube accounts, the YouTube guidelines Upload videos longer than 15 minutes apply:
By default, you can upload videos that are 15 minutes long. To upload
longer videos, follow these steps:
- Visit the upload page at www.youtube.com/my_videos_upload
- Click Increase your limit at the bottom of the page, or visit
- Follow the steps to verify your account with a mobile phone. Currently we aren’t able to offer other
ways to verify your account.
Once you’ve increased your limit, make sure you’re using an up-to-date
version of your browser so you can upload files greater than 20GB.
There is no maximum number of videos.