How many spanish holidays are there?
I only know a few.
If you "click" on the link provided here it will take you to a web page that seems to show all the holidays for Spain>
See The Calendar Page in this link ----> Spain 2009
Aside from all the holidays you learn in the classroom or on lessons, there are tons of regional holidays wherever you go. For example I am in Zaragoza, Spain, where "La Fiesta de Nuestra Señora del Pilar" is very important, but I'm going to Madrid next week where they're celebrating "El Día de Almudena".
I'm not quite sure what you mean- but if you mean as in public holidays, there's a lesson on learn spanish 2, I think it is which is quite interesting.