As a film, however,Senecais almost unendurable.
Its not really a job for life.
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Schwentke describes his approach to updating Tacitus as aggressive anachronism.

Seneca - On The Creation Of EarthquakesBerlin Film Festival, Filmgalerie 451
No opportunity is missed to trowel on the parallels between Rome and our own times.
Seneca is a sell-out.
He has one night to kill himself, or the guard will do it for him, Neros way.

You dont want that, he says.
Seneca accepts his fate.
But that point is already made: hes a dreadful windbag.
By the end, people in the press audience were screaming at him to get on and die.
Anyway, no spoilers here, but you might find out what happened next in the Annals of Tacitus.
Theyre way more fun than this.