When it goes a certain distance, it may start to move more quickly. Some have estimated that at some point in its travel, magnetic north may move 53 degrees within one year. The really cool thing is that as the magnetic field moves more quickly, so does the outer core (seismic and volcanic fun for sure). Something else cool... The NOAA not long ago revised quite a bit of previously stored data to show less movement and lack of acceleration. It is accelerating.
Umm, the earth’s crust does not flip. Nothing changes in association to magnetic the pole flip. It’s just the magnetic field’s orientation which reverses. There’s already an area of N magnetic in the South Atlantic near the Falkland Is.