Hummus contains nothing that will go bad quickly. Garlic, olive oil, lemon juice, tahini can all be kept in the fridge for quite a long time. When you make Hummus, you make it 3 days in advance to allow the flavors to mingle. After that, you can store it for several weeks. The only tip I found was to drizzle some olive oil on top because it might keep it from drying out in the fridge. Hummus, from the Middle East was created long before refridgerators were invented. I'm even pretty sure you can keep some out without refrigeration for a while. People even eat fermented hummus-- that is probably the original way-- before refrigeration, many things were kept by fermenting.