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WBUR13.8 Million Viewers Bid Farewell to David LettermanAdAge.comDavid Letterman's 77-minute finale delivered the biggest audience for "The Late Show" in more than 20 years. According to Nielsen, Letterman's farewell averaged 13.8 million viewers, making it the fourth most-watched "Late Show" of all time and the ...Where Advertising Is Looking For YouWBURLetterman gets 13.7M in finale, but Leno did betterLocalNews8.comall 3,157 news articles »