"That was a bit much though, because you start reading to finish, not to enjoy."

I know what you mean. I found the appeal of the "challenge" was not so much the numerical exercise (which is a bit . . . well . . .) but the fact that it made me think about what I was reading rather than just glomming through books with my jaw slack. It's (for me) like a sort of halfway stage between the latter and the far more rigorous effort of full-scale reviewing.