That is about the same as the time for the solar system for each pass through the galactic plane. The time for a complete oscillation from one side of the galactic plane to the other side and back is about 60 million years which makes about 30 million years for each pass through the denser galactic plane.
Planet Earth going thru the galactic plane.
Maybe just a ship thru the rings.
https://youtu.be/uDaOYj2wggg?t=63