Rose should be drinkable for a few days after opening, and should be kept in the fridge. Even if it is slightly on the turn it won't hurt you. Be guided by the taste.
WHEN, I was drinking (past tense), I would never have had to ask this question! Opened and drunk same night or same hour. However, kept cold and corked, a good few days to a week.
all wine (red, white and rose) can be kept in the fridge, as long as you put the cork back in, for up to a week apparently. i was told this by an expert...obviously you have to let the red warm up again before you drink it