Might as well be 10 - 1000 years. Reality is no one knows how long it'll take to get to AGI, because: 1) No one knows what exactly makes humans "intelligent" and therefore 2) No one knows what it would take to achieve AGI Go back through history and AI / AGI has been a couple of decades away for several decades now.
Aside from that the measure really, to me, has to be power efficiency. If you're boiling oceans to make all this work then you've not achieved anything worth having.
From my calculations the human brain runs on about 400 calories a day. That's an absurdly small amount of energy. This hints at the direction these technologies must move in to be truly competitive with humans.