The answer to a related question, who has been on television the most hours, is answered here: Regis Philbin at 15,188 hours.
However I’d like the answer to a slightly different question, one which I realize might just come down to speculation. Who has had the most hours of being watched spent on them? That is, if a couple watches a Seinfeld episode where Jason Alexander is on screen for eight minutes, he gets sixteen minutes added to his total.
I’m pretty sure some big shot actors are eventually able to negotiate royalties that might approximate this statistic into their contracts, in that they get cuts of syndication money, and syndication rights are bid up by television channels based on what viewership they think they can pull. But that would only ever be a rough approximation, especially since Jerry Seinfeld probably commands more cash for the same amount of time than Wayne Knight.
One could hack together a more accurate figure with access to decades of television ratings and just lists of characters for each show episode, if not specifically screen time. Has somebody already done this?
Lastly I suspect the collective intelligence here at the Dope has some good guesses about who would qualify. Off the top of my head, the list of people with over a billion audience-hours would include high-ranking sports broadcasters, national news anchors, and stars of long-running and long-syndicated shows. Also VIPs who are in very public positions such as POTUS.
Here are some back of the envelope figures:
Barack Obama @ 5 State of the Union Addresses @ ~60 mins @ ~40mil viewers each: 200 million hours. Surely his total including the rest of the Presidential publicity, and campaigning and debates and ads, is well over a billion.
Jon Stewart @ ~2,000 hosted Daily Show episodes as of 2013 @ ~20 mins @ ~1.4mil viewers per night as of 2008: 930 million hours
Lucille Ball @ 40 million viewers per year even in 2011 @ 60 years since first aired @ 20 minutes an episode: 800 million hours (I will admit this is the sloppiest guess)
Neil Armstrong @ the 2 minutes of the first steps @ 530 million live viewers but I’m assuming almost everybody alive since has seen them so anywhere up to ~9 billion: 18-300 million hours
And for funsies, the most watched video on Youtube is the music video for Psy Gangnam Style @ 1.7 billion complete views @ 4 minutes: 110 million hours
Is there anybody out there that’s already done the figures for this question? Obviously for each of my examples I’m excluding a lot of other material that would have pushed them over a billion hours, but maybe it’s harder than I guessed.