He talks about the time estimate in the book. He says he understood the need for a time estimate, and so gives the one he thinks is best. But the important thin

He talks about the time estimate in the book. He says he understood the need for a time estimate, and so gives the one he thinks is best. But the important thing is that he feels confident it will happen before artificial intelligence that isn't full-brain emulation, whether that's in one century or four centuries.