from my experience: cooked/fried food, if properly stored (sealed and in a fridge), usually lasts up to a week before it starts going bad - it can often stay good for much longer after that; as an example: I've once (well more than once) found a cheesecake my grandma made buried at the back of the fridge that was nearly a month old, and it was still fine (most likely because she added vanilla pudding mix to the cream - that stuff has enough preservatives in it to give it a best before date of nearly 2 years, so it's highly likely that a non-negligible amount of those preservatives just got mixed in with/seeped into the rest of the cake and extended its lifespan by several weeks).
