There are few German based pilots on this forum. Probably better to find a German forum?
How long does it take? I suspect its going to be similar to every where else: ie it depends based on lotsof different factors. As everything in Europe is either EASA already or is becoming EASA - most of the requirements are fairly generic across all of Europe. That includes how long it will take...
Price will (I suspect) vary hugely depending on the number of flying hours it takes, what plane you are using and whether a simulator is used for some of the training. A two second google for a German PPL brought up as a first hit
Air Alliance | PPL(A) Private Pilot License
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http://www.air-alliance.de/files/ppl...rnkurs_neu.pdf
€10.650 without night qualification looks about right to me (compared to the UK), and that assumes minimum hours (and doesn't include various other things... I've no idea whether that's representative.
I doubt there is any actual statistics anywhere for this - its just a case of looking around and asking.