4.5 billion years in the future
The half life of uranium-238 (U-238); in other words, about half of the U-238 comprising about 96% of commercial SNF will have radioactively decayed into the more-stable daughter isotope radium-226 by this time (Pappas 2017).
Scientists believe that 4.5 billion years ago the Earth was a unformed mass of molten rock (see image), so it is anyone’s guess as to what the planet will look like that far in the future (Specktor 2018).