I dont know, if I had lived in ancient Greece and suddenly appeared in 1700's Greece I probably would not take that long to get acclamated. I mean people still plowed fields with their animals and raised the same olives and rode around on horses and all that good stuff and figuring out how firearms worked would be pretty easy to do...on the other hand if I was a 1700's Greek and suddenly woke up in 2004 I probably would suffer some kind of nervous breakdown as things have changed so radically. The last few hundred years have been the exception in human history rather than the rule.
Another example, if I was an ancient Phoenician Mariner from 2000 BC and suddenly woke up in 1840 AD the difference between my ships and the ships they are using in 1840 would be very different, but they are still using wind powered wooden ships. You could argue that in terms of sailing no vast jumps in technology occured between 2000 BC and 1840 AD (well there were cannons and the triangular sail, and better hull design and navigation but all those are refinements on the original Bronze Age technology-nothing a Bronze Ager couldn't recognize)