The wall was completed in 52 days, on the twenty-fifth day of the month Elul.
References for Nehemiah 6:15
When all our enemies heard this, all the surrounding nations were intimidated and lost their confidence, for they realized that this task had been accomplished by our God.
References for Nehemiah 6:16
During those days, the nobles of Judah sent many letters to Tobiah, and Tobiah's [letters] came to them.
For many in Judah were bound by oath to him, since he was a son-in-law of Shecaniah son of Arah, and his son Jehohanan had married the daughter of Meshullam son of Berechiah.
These nobles kept mentioning Tobiah's good deeds to me, and they reported my words to him. And Tobiah sent letters to intimidate me.