It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
Well, considering we are more mentally evolved than the first cave-men, we could probably do it a lot quicker than the 1st time, skipping many of the primitive development stages. If they save books/data and scientists in underground bunkers we'll have the knowledge to rebuild society basically back to where we are now, but it would depend on the surface conditions of Earth. We could be forced to live underground for a period of time.
But this thread isnt to debate the merits of that theory, want I wanted was peoples ideas on how long it would take starting from scratch with no tools or technology to get from the stone age to where we are today with radio, computers, satelites etc etc.