I've got a very weak signal ventolin tablets 4mg dosage Writers and actors aren’t the deciders here. Networks make that call. Their thinking has always been that more episodes of a hit show means more money. That’s why, in TV’s early days, networks wanted prime-time shows on the air for 39 weeks, taking a break only in the low-viewership summer. Then as costs rose, networks started cutting back, until a few years ago the standard hit 22.