It’s impossible to say.
The main reason is that you don’t create viral videos. You create regular old videos, and if you are lucky, they become viral. It’s the audience that makes them viral, not the creator. (What you are saying is something like “I want to create a best selling book”. All the author does is write the book – the readers decide it it’s any good by buying it and making it a best seller.)
That said, again, it depends on the video and the audience. If your audience is surgeons doing cardiac surgery, the bar for being viral might be 1000 views. If your audience is people doing stupid pet tricks, then there is a heck of a lot more competition. And if your video is some sort of music, then there is an enormous amount of competition and being viral will be difficult.
Concentrate on making the best video you can. If it’s any good, people will watch it. If it’s not, well, then you learned something.