The question of script length comes up from time to time. And it's tricky to know how to respond for various reasons. Some measure sitcom scripts in pages. That's probably the industry standard, not least because when you're filming on location, pages get broken down into eighths and shooting time is allotted accordingly.
Scripts filmed in a studio in front of an audience have to be carefully monitored for length too. Most sitcoms I've filmed have started shooting at 7.30pm and you really have to be done by 10pm for two main reasons. Firstly, the cost of overrunning in terms of overtime, studio time and wages can get out of hand quite quickly.
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But secondly, by 10pm, even with a jolly warm-up guy, the audience really has had enough. They probably arrived at 6.30pm and have been herded about. The magic of television has worn off and, to be honest, they're done by 9.30pm, but if you've got a strong ending to film in front of them with a big pay-off, you're probably going to be fine.
Until 10pm. At which point the audience turn into pumpkins or mice or something that isn't known for laughing much. And you can't really stop them from leaving either. And some do. And it gets embarrassing.
A decent producer has a pretty good running time clock in their heads and your page count on the night should be about right. And if it's not, it's their problem far more than yours.
If you're looking for a rule of thumb for a pilot script that you're sending out, bear in mind you're trying to sell an idea and a set of characters, not a shooting script. I'd urge you to make your TV script as tight as possible. Something between 30 and 35 pages. Cut anything that doesn't belong. Cut jokes that are just there for the sake of it, especially in the second half of the show when you need to crack on. Be ruthless. I've written about that here and here and here and in my book here.
The Glory of Radio
It's tempting to think that in radio, where everything is much easier to record, all bets are off. There's no 'location' stuff to be pre-shot, no big reveals or stage management to work out. No props, no set and know make. Plus the actors don't have to learn lines. They just read them off the script. Which partly explains why actors love doing radio and you can often pull in bigger names than you think. It's all the fun of the show without all the drag of TV production. (But way less money, obviously.)
A typical radio studio sitcom episode might record at 32-34 minutes. Then there a few retakes. Then an interval. And you record another episode. Yes, you can record two shows in one night, and still be done by 9.30pm.
In fact, recording two episodes in one night is a blessing because the audience, who might not be very familiar with the show, especially if it's brand new, will be up to speed by the second show and be looking out for their favourite characters and catchphrases. They're not worried about knowing who everyone is. The cast might be more relaxed. As a result, the second episode tends to record better and the audience laugh more. (One day, I expect a note from an exec suggesting we record both episodes second.)
However, there are laws of diminishing returns here too. The plusses can become minuses. In the second episode, the actors might start to get tired, the studio can get a hot making the audience flag and dry up. You'll want to stick to a 32-34 minute recording. Any less, you've got little room for manoeuvre in the edit. Page formats vary in radio where there are fewer script standards and protocols (every single radio script I've done has been in Word, not Final Draft) so a page count isn't helpful. But in words, for me, that's usually around the 5500 mark.
It might be tempting to get away with a script of 6500 words. Or longer but if you listen to the Sitcom Geeks podcast with Graham Linehan, you'll hear why it's not a good idea.
In their first show, Paris, Linehan and Mathews learnt a few lessons the hard way. One is that if you write a script that's too long, and film all of it, it makes editing almost impossible.
The only way to produce a coherent 24-28 minutes is to cut jokes. Disaster. The story has to make sense. There has to be continuity. There's a lot you can't cut or the entire programme disintegrates and seems random, disjointed and unprofessional.
That's not an option.
What your producer and director and editor will cut are funny routines, gags and throwaway lines (which are literally thrown away).
It's always tempting to write long - and I've done so and regretted it for other reasons (when I wrote a 9000 word draft) - but writer beware. And if there's one thing you shouldn't do, it's Forget Paris.