All 12. I am two seasons behind but plan to binge watch them. Overall, highly recommend. Season 5 is far and away the best though.
The show has fantastic writing that frequently finds way to poke fun at the show within the show ( there's an episode where the main characters play fictionalized versions of themselves, playing the characters they play on the show -good stuff) with clever plots and tends to rely on good acting instead of special effects.
Does a good job mixing humor in with dark themes.