As you might already guess, one of the things I love about poke cakes, including Banana Pudding Poke Cake, is the fact that they can be prepared ahead of time. Despite it only having to rest in the fridge overnight, this cake tastes best when it's chilled for two hours. You should really make it the night before you're going to serve it! Remainders will keep well for 2-3 days in the fridge, so feel free to keep them. When adding Nilla Wafers to the top, don't leave them on the cake for too long, since they will soften if they are on it too long.