Depends how good the book is. If I'm really hooked I can read for hours but I need total silence or some gentle instrumental music. Nothing with lyrics or I end up listening too much to the song. ๐
It also depends on the type of book. I love my "making of" books about films and I buy those in a physical form. If it's fiction, I'm quite happy to read on my basic Kindle. I used the Kindle (3rd gen) for years. It was the model with a keyboard. But during a black Friday sale, my wife bought her and myself a cheap 10th gen model which has the backlight.