Time spent listening
Encyclopedia
Time spent listening is one of the measurements surveyed by Arbitron
Arbitron
Arbitron is a consumer research company in the United States that collects listener data on radio audiences. It was founded as American Research Bureau by Jim Seiler in 1949 and became national by merging with L.A. based Coffin, Cooper and Clay in the early 1950s...

 in determining ratings for radio stations in the U.S.
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

. The TSL is the amount of time the average listener surveyed spent listening to each radio station at one time, before changing the station or turning it off.

The TSL is an estimate of how long the average panelist (listener)
was exposed to a particular station or stations for a
specific time period.

It is the equivalent of Average
Time Exposed (ATE), Daily or Weekly.

TSL trends are helpful in determining
if programming decisions are having an effect on
the audience.
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