I have a question about using "when I did ..." and "when I was doing ..." in a certain sentence.
When you are talking about a currently busy store that you worked at several years ago, are both of these sentences appropriate?
Business used to be slower when I worked at the store.
Business used to be slower when I was working at the store.
I think both "when I worked ..." and "when I was working ..." are fine if the sentence begins with "Business was slower ..." but I don't know if they are fine when you use "used to be" in the sentence instead of "was."