>>269567087
Took me around a year to git gud at blender but I've been using a bit (not for serious project) since version 2.4something so I had a lot of knowledge but not much experience. I'd say a year is doable to get to the point where you can model, texture and rig characters from scratch. You don't need to know much about unity to make basic stuff. You don't need to know how to animate either unless you want custom anims of course.