That's.... not really how it works. It's not just about how much you shoot, it's also about how much you get done in a given amount of time.
The typical shooting schedule for a film is about 3 months. That means you budget how you can complete all the shots you think you need in that amount of time. If you need to do pick up shots later during post-production, it's possible if you can afford it.
For serials, the overall shooting schedule itself might not be longer, it might actually be shorter than film. You just have to get more done in the limited time, so everyone might have to work harder, or corners have to be cut. Shooting a full 22 episode season could take maybe 6 months. That means it's a lot more rushed shooting TV than film.
True Detective had about 100 days of principal photography iirc, which is pretty damn long for a TV schedule, especially one which only has 8 episodes. In terms of actual time allocated in terms of days that's about a single film shooting schedule, but it means that everyone involved had to work much harder every day to get more done. Since the entire series was filmed on location, it also meant they had to deal with harsh weather, wildlife, and so on.