Nutella salami will keep for 2-3 days in winter out of the fridge, and, in summer, for the same time in a suitable container in the fridge. You can also freeze it, allowing you to make it in advance and then thaw it when required, making your work easier and saving time. Another tip: if you want a stronger flavour, maybe when it’s just for adults, you can add a few drops of rum or other liquor of your choice, or some almond or lemon essence