Question: Schengen Visa Duration of stay

[dajv]

Hi,

I have a multi Schengen visa, and on the visa stamp, there's a Duration of Stay stated for 9 days. I used up whole 9 days during my last visit. No I plan to visit Schengen area again, do I need a new visa since I used all 9 days or I will get another 9 days for next entry???

thanks a million