Argh, why did you PM me if you've also posted here? I'll paste the response to the PM here so it'll be available for anyone else who's wondering.
Do a search online for Schengen. All this information is easily available on the website of every European embassy.
Keep in mind that the computers at the borders are tracking your total time in the Schengen zone. The standard response if you're caught overstaying is to ban you from all Schengen countries. If you're in one when you're caught you'll be deported at your own cost and your passport stamped. That stamp will make it difficult to enter any country, since they'll wonder why you were banned from the Schengen zone. If you've left the Schengen zone and are caught re-entering, having previously overstayed, you'll simply be barred from entering. This could be a problem if you're planning to fly home via one of the major airports in western Europe.
Although strict border controls don't exist between Schengen countries it's still common to have your passport checked by the police if you take a train between countries. People who avoid being caught are usually staying put in one city for the whole time.
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