Given the background description of some cooking related query, summarize the question into a title

Example Input: My icing is 1/4 cup butter to 1 1/2 cups of icing sugar and a couple tablespoons of milk, so I'm thinking that with so much sugar, the answer is "almost indefinitely in the fridge."So, as the title says, how long is it reasonable to keep the remnants of a batch? Although I've made small amounts (like the above recipe) on occasion, I'd like to make a big batch, seal it up, and use it as needed.(I realize that it might not work as well a month or two down the road, I'll experiment with it if I decide it's ok to use.)
Example Output: How long does butter cream icing keep?

Example Input: I was just wondering if I can arrange raw chicken on the pizza base and cook everything along or if I should cook the chicken first separately.
Example Output: Should chicken be cooked beforehand while making pizza?

Example Input: I'm making a tomato sauce cold from tinned tomatoes and I was going to add tomato puree to thicken the sauce. Is it ok to use tomato puree without cooking it?
Example Output:
Do you need to cook tomato puree?