Are you sure about that?
Doesn’t it depend whether it is “civil” or “criminal” contempt? I think “civil” contempt has no set limit on the duration of the sentence and can continue indefinitely until compliance is forthcoming.
What about this guy?
https://en.wikipedia.org/wiki/H._Beatty_Chadwick
Served 14 years for a contempt charged he wouldn’t comply with.
On July 10, 2009, Chadwick was ordered released from prison by Delaware County Judge Joseph Cronin, who determined his continued incarceration had lost its coercive effect and would not result in him surrendering the money.