How cold should I serve sangria?

I bought a bottle of Sevillana (a brand from Venezuela - if you've had it, please give me some feedback) at room temperature. I know sangria is supposed to be served cold, but like how cold? It's not strong enough (9.5% alcohol) to chill in the freezer so I was going to keep it in the fridge. How long (once opened) is it still ok to drink?