Assuming 10 hours a piece, 6k books feels a very achievable dataset. Even Librivox claims 18k books (with many duplicates and hugely varying quality levels). If

Assuming 10 hours a piece, 6k books feels a very achievable dataset. Even Librivox claims 18k books (with many duplicates and hugely varying quality levels). If you wanted to get expansive, you could dig into the podcast archives of BBC, NPR, etc which could potentially yield millions of hours. [0] https://librivox.org/ https://librivox.org/