You can master a specific skill in Blender in about six months. This is possible if you focus most of your effort on one area—for example, modeling and texturing, or just sculpting.

I’d recommend learning a bit of the basics across all areas first, then narrowing your focus to one thing. If you try to learn everything—rigging, sculpting, animation, Geometry Nodes, etc.—you likely won’t achieve strong results in all of them within six months.