The second part of "Zarathustra" was written between the 26th of June … — Thus Spake Zarathustra
SAPIR 861
The second part of "Zarathustra" was written between the 26th of June and the 6th July. "This summer, finding myself once more in the sacred place where the first thought of 'Zarathustra' flashed across my mind, I conceived the second part. Ten days sufficed. Neither for the second, the first, nor the third part, have I required a day longer."
Open Scriptures Hebrew Bible (WLC), CC BY 4.0