I can easily do half an hour or more for my six year old at night. Have always been reading for him, but it's more enjoyable now that he understands more interesting works.

Revisiting my child hood classics such as Hardy Boys, mixing in Harry Potter (books are so much better than the first and only movie that I saw) and so on: Feels like quality time, and a great way to connect. I can easily get into those books too, even in my mid 40s. ;)

I have noticed that enjoyment increases with my reading engagement level - creating different voices for the different characters and such. He has attention issues, and it's a pleasure to have him focusing on something other than a screen. I will stop every few minutes and ask questions to check if he is really listening to the story and not just the sound of my voice. Previously, it might have been more of the latter.