If someone says "Have you got a minute?" the natural people-pleasing human response is to say yes because you assume that someone won't interrupt you unless it'

If someone says "Have you got a minute?" the natural people-pleasing human response is to say yes because you assume that someone won't interrupt you unless it's important. You need to let go of that notion and assume that their inquiry is of the lowest possible priority, and literally anything else you're working on is more important. Unless you've got nothing else on at the time this means you can happily say "No, I don't have a minute." People will quickly learn that they need to say why they need to interrupt you in order to actually break your flow.