If someone speaks in an unexpected accent, even if it's an unambiguous and internally coherent accent so that it's perfectly possible to understand it it takes

If someone speaks in an unexpected accent, even if it's an unambiguous and internally coherent accent so that it's perfectly possible to understand it it takes a few seconds for well-meaning natives to adjust to. It does get tiresome to have to repeat yourself. You want to at least get to the level that if you talk to someone, it registers as English immediately.