According to NCIS supervising editor Gregory Gontz[1]https://www.cheatsheet.com/entertainment/ncis-how-long-does-it-take-to-film-episode-ncis.html/, it takes eight days to film one episode. After filming, a lot goes into making sure the episode is as polished as it can be. “It’s an eight-day shoot on NCIS, so they’ll shoot, say, on a Monday, and I get those dailies on a Tuesday,” Gontz told CBS. He says he starts his work after the episode is filmed, so he’s always a day behind. It takes him roughly three days to edit, add music and sound effects, and review his work.
Another example is Stranger Things. Accoding to Slahsfilm [2]https://www.slashfilm.com/stranger-things-shawn-levy-dan-cohen-interview/2/, the filming of the first season of Stranger Things lasted for six months. They spent eleven days filming each episode.
So we can say that a typical shooting schedule for a one-hour prime time network drama (45 minutes in running time) is 8 or 12 days. To save money, more and more shows are doing something called ‘cross boarding,’ which involves shooting multiple episodes at once. So they’ll set up at one location and shoot everything that happens there across several episodes.