Have a look at the size of the Finnish waste repository.

“They’ll hold a total of 5,500 tonnes of waste,” says Joutsen. “So Onkalo will take all the high-level nuclear waste produced by Finland’s five nuclear power plants in their entire life cycles.”

https://www.bbc.com/future/article/20230613-onkalo-has-finland-found-the-answer-to-spent-nuclear-fuel-waste-by-burying-it

The Finnish repository is designed with a life of 100,000 years. Homo sapiens (i.e us) have existed for about 300,000 years.

Article about the problems warnings that will comprehensible in 10,000 years https://www.bbc.com/future/article/20200731-how-to-build-a-nuclear-warning-for-10000-years-time