yes, the pulp can last longer. but, I recommended checking it every day. I always check my food in the fridge. because we never know what would the exactly thing happen, maybe the container is not good enough, or the temperature is not stable.

you can do many things with oatmeal, but sometimes you can be bored if you just think about the taste or pleasure. so, thinking about the health aspect and we are not be bored of the "bland" oatmeal :)