From Donna Roach:
Years ago I used a free service I found on the internet to help me write 30 and 60 second spots. It used a word counter to compute the length of time the commercial would take. Does anyone know if that type of service is still available? I have not been able to locate it. Thanks!
I'm in a small market station that sells mostly 30s, because they always have. We're not sticklers at spots being exactly 30s, so a few extra seconds is no big deal to us.
As a rule I was taught a 30 second commercial was about 75 to 90 words and double for a 60.
I was taught 8 typewritten lines was a 30. My question was the margin, font size and such. It seems most typewriters were 12 point font sizes and margins generally an inch meaning 5.5 inches of typed lines of 55 characters/spaces.
The most specific I have seen is an NPR station. They go with syllable count: 75 to a 15 second Underwriter Announcement. Their rule of thumb is 5 syllables per second. I found it hard to 'count syllables' but the accuracy is incredible. So often our copywriting might include $1.99 or 10 digit phone and so forth, this syllable count works best of all. And 5 syllables a second is a pretty good pace.
Word has a word counter built in if you are writing your own, but ChatGPT writes to the length you ask for!
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