I´m from Germany, and I don´t live far (one-hour car ride) from Marianne who also is my favourite long-hair model.

There is a German website (langhaarnetzwerk) where women encourage each other to grow out their hair, exchange advice on how to do it, report extreme long hair sightings etc. Beware, however: they are careful not to attract and tolerate long-hair fetischists with overt sexual intentions. And by the way, communication there is all in German.

I have never met any of the women on that forum in real life, but from occasionally looking into it I get the feeling that there must be dozens of German women growing their hair to really extreme lengths.