How Long Does It Take to Switch Your Context?

Even conscientious knowledge workers who think they're pretty good at focusing on one thing at a time are actually still working far from the sort of high performance, deep work ideal. Even those very brief checks that switch your context even briefly can have this massive negative impact on your cognive performance. Is to switch itself that hurts, not how long you actually switch. And it takes a while for this attention residue to clear out.