They last 3-4 days in the fridge in a covered container but three days on average. The chia seed pudding and yogurt is usually fine by days 3 & 4 but if the fruit on top isn't super fresh when you make them or if it's wet when you add it to the top it can mold and cause the parfaits to go bad sooner. One option here is to make the parfait but leave the fruit out until you're ready to serve them.