TASK DEFINITION: Given the background description of some cooking related query, summarize the question into a title
PROBLEM: 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.)

SOLUTION: How long does butter cream icing keep?

PROBLEM: I have a problem. Let's say I buy a frying pan for about 130 EUR. But after 5 months of using it 3 times a week, it looks like the photo. What am I doing wrong please ? (I never scratch the pan. I always wait until it's cold before washing it, I protect the Teflon with shoam)Edited: to react to your comments, my habits are: preheat the pan for about 6 minutes on the biggest flame without oil - to prepare it for a steak. But i use it like this for about 20% of time. Is preheating damaging the Teflon? If so.. what material should i use?

SOLUTION: Frying pan Teflon damage

PROBLEM: This is the second avocado from the same bag that is tough and rubbery. The pit won't come out without leaving a skin, and it won't peel out of it's skin without cutting the skin off. I made sure it was soft and was at room temperature before I cut it open. How can I de-rubberize them?

SOLUTION:
Why is my avocado tough and rubbery?