I pay attention to the crime novels that get a lot of pre-publication buzz. It's both an essential part of my job, and a perk.
Recently there was a lot of buzz about The Cartel by Don Winslow. I'd read an earlier book of his and loved it. I looked forward to reading this new one; there were comparisons to The Godfather by Mario Puzo (a seminal book in my crime reading eduction.)
I started it pretty near pub date, then set it down for something else. During this vacation, I picked it back up again thinking I'd have a block of time to finish a 600+ page tome.
And set it down again at page 200. (I'd started over again cause I'd lost track of the plot in the intervening weeks.)
There wasn't a single character I cared about, there seemed to be no depth of character at all. No sense of these characters as real people. And the violence, dear god, the violence.
I decided to put this on on the stack of "did not finish" rather than invest another 12+ hours in the remaining 400 pages.
How much time, how many pages do you give a book before saying "nope, not gonna finish."