Parallel
Nehemiah 6:15
Louis Segond 1910 · Berean Standard Bible
La muraille fut achevée le vingt-cinquième jour du mois d’Élul, en cinquante-deux jours.
So the wall was completed in fifty-two days, on the twenty-fifth of Elul (note: Elul is the sixth month of the Hebrew lunar calendar, usually occurring within the months of August and September.).