I have no information as to what the parent is referring to but 2^10 is 1024. That seems roughly in line with what a double-page spread of a phone book could sh

I have no information as to what the parent is referring to but 2^10 is 1024. That seems roughly in line with what a double-page spread of a phone book could show you; I don't think it's unreasonable that a trained human could search through one of those in under 10 seconds.