If you have the option, whipped cream is always best made as close to serving time as possible. That said, this recipe will hold for days. The chocolate cake that we usually frost with it is large, so sometimes there are leftovers in the fridge for several days. The frosting holds up just fine for that time. If you haven't frosted a cake with it, store leftovers tightly sealed in a nice, cold fridge for up to three or four days.