1. In the U.S. television industry, 100 episodes is the traditional threshold for a television series to become viable for syndication. 100 episodes are advantageous for stripped syndication because it allows for 20 weeks of weekday reruns without repeating an episode, and such shows can be sold for higher per episode pricing.
Syndication is often a profitable enterprise because series can be rerun for years after they end production. Shows of limited profitability during their first run will still prove to be viable to the production company if they can last 100 episodes. This point is usually reached during a series’ fifth season.