You need much less if you are fine with horse level understanding of 3d environments. Those get to a working level much faster (hours) and are still good enough

You need much less if you are fine with horse level understanding of 3d environments. Those get to a working level much faster (hours) and are still good enough to navigate complex environments safely and not step on children. Then you realize the limitation isn't the training data but the base model that was trained from hundreds of millions of years of evolution, and you start to see the real potential hurdle we have to clear.