As that is a Swyama Siddha Hanuman Mantra it doesn't have for being chanted for a set amount of Mantra Repetitions for having the ability to utilize it. Distinctive worship and rituals and policies concerning way, sitting down mat, and counting rosary usually are not recommended for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s