That depends on the quality of content, type of content and your audience. I make fishing adventure videos that are basically documentary films in their own right. I compose my own music for them as well. It takes a long time to produce those. I can only get one video a week out like that.
Contrast that with a gaming channel, where only have to play a game and record what they're doing, could literally upload twice a day.
Again, in my case, I also run an online fishing tackle shop. Tutorials are easy to do. I could easily crank out three tutorials a week, but my audience doesn't want to watch tutorials. They want to see documentary films about fishing. So, I save the tutorial videos for my customers in teaching them how to use the products I sell or update them as to production times and such. I may only do a few of those per month.