The first part of "Zarathustra" was written in about ten days--that is… — Thus Spake Zarathustra
SAPIR 861
The first part of "Zarathustra" was written in about ten days--that is to say, from the beginning to about the middle of February 1883. "The last lines were written precisely in the hallowed hour when Richard Wagner gave up the ghost in Venice."
Open Scriptures Hebrew Bible (WLC), CC BY 4.0