How many generations to regain technological/mechanical skills from primitiveness?

Question

If some apocalyptic event wiped out most of the human race, which over the years recovered and developed into hunter/gatherers with spoken language, AND, they had available to them working modern technology (remnants of their previous glory - specifically, something like Vox 114, the talking AI database of knowledge from the 2002 film version of "The Time Machine"), how many human generations would it take for them to re-develop to the point where they are technologically equal to the society that created such devices?

Answer 1

In my opinion, if some humans did survive, they would not revert back to the hunter/gatherer state.  The knowledge base which would endure through the humans who did survive would be enough to jump start a civilization immediately.  Or, at least, the idea of and the determination to re-create a modern type of society in terms of democratic, economic and moral principles.

And, language would also be preserved intact.  So, we could immediately re-start the communication process, even if it was primitive at first.

With a knowledge of the alphabet and rudimentary mathematical skills which would have survived, we could immediately jump forward into at least the 1600's in terms of intellectual expertise.

So, I think that we could rebuild our economic and cultural infrastructure within 400 years.