This is key when trying to build a YouTube following. If you look at many of the famous YouTubers, they all upload at least once a week, normally on a certain day. The advantage of uploading once a week shows that you are dedicated to your Subscribers, and in turn people will feel more obliged to subscribe to you because of the effort you put into your videos. It also means your subscribers know when your videos come, and know when to check for new videos from you.