It really depends on how fast your family will eat it, LOL. My 11-year-old son took out half this recipe in one morning!u003cbr/u003eu003cbr/u003eIdeally, though, this baked oatmeal recipe will last a few days. If you’re serving baked oatmeal for one, wrap each portion individually once it’s done and store it in the fridge or freezer.