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Sausle, liebe Myrthe
279 is 85% of 328.24
Judging by recordings on YouTube, the opera is around 2 hours and 15 minutes total.
Des Esels Schatten was his last, although it was left incomplete after his death. His last completed opera is Capriccio.
There are 3 syllables in the word opera. Op-er-a.