He said: “By Allaah ten times, I will not do such-and-such”. Should this be counted as one vow or ten?

Praise be to Allaah. 

We put this question to Shaykh Muhammad ibn Saalih al-‘Uthaymeen,
may Allaah preserve him, who answered as follows:

It should be counted as one vow. And Allaah knows best.