King Charles III ascended to the throne in 2022 after a spending a remarkable 64 years as the Prince of Wales (the title given to the heir to the throne).

His mother reigned for 70 years, but the King's age (he's currently 75) makes a comparable reign vanishingly unlikely.

There are a few ways that Charles III could stop being the King:

In which year will King Charles cease to be the King of the United Kingdom?

 in "other" and I add more years after 2030, you will automatically receive the same number of shares in each of those new years. You can trade/sell them or you can just hold onto them and be in the same position as if the additional years hadn't split out and the market simply resolved to "after 2030".