If you interpret OP's term "work" as "perform on the public stage", then it comes across as non-sarcastic.
I don't think they meant to say that NFL players loafs around all year except for a cumulative 17 hours.
I don't think they meant to say that NFL players loafs around all year except for a cumulative 17 hours.
Versus, say, a touring rock band that gets a cut of the performance revenue. I don't think there's anyone paying them a multi-year contract salary.