Duration of Stay Schengen bölgesinde kalacağınız toplam süre, her girişi çıkışta sıfırlanmıyor. Eğer yanılmıyorsam, vize 6 aydan uzunsa o zaman 180 günde bir sıfırlanıyor sadece.
"On the other case, if you have a double-entry visa, with a visa valid from January 1 to March 1, and a duration of stay of 10 days, then you can enter the Schengen Area twice within this period. You are still not allowed to remain more than 10 days during both trips. If during the first trip you stay 7 days, then in the second trip you can stay for three days at most. If you make just one trip and spend 10 days in any of the member states, then you have no right to enter the country despite of the fact that you visa is still valid."
www.schengenvisainfo.com