In the UK I generally saw good customer service is "I had a problem, that problem was solved quickly and efficiently". The time spent solving that problem is likely unpleasant, so get it over with as soon as possible.
In the US it feels more "The person trying to handle the problem is personable and friendly". The time it takes doesn't matter so much, as there's a focus on trying to make my time during it as enjoyable as possible.
I get super frustrated waiting at a bank or similar and the person in front is having a chat with the teller, I don't want to be in the bank, I don't want to have a chat, I have some specific goal (like getting change) that I want achieved and leave as soon as possible. That is what I consider "good" service.