>>410294934
10 hours for the basics of blender and unity to make a change to an existing avatar and successful upload. Most of that time will be getting familiar with the software itself, both blender and unity are extremely complicated and intimidating programs. They were very difficult when I started: I would often break something, not know what I did and lack the vocabulary to even describe the problem I wanted help with. There's probably some "introduction to blender" book or tutorial that could have helped me a lot. Maybe start there.

Expect 300+ hours to go from no experience to making a serious full-featured avatar from scratch. Less if you want to make a meme avatar like a floating tv or something.

If that's your ultimate goal don't be discouraged. Most people here don't make a from-scratch avatar, they buy an existing avatar base and learn the minimum whenever they want to add to it. If you just follow their example and try to do something new each time you'll slowly learn all the areas you need to know to make something completely original. Baby steps like >>410303359 says.