As that is a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a hard and fast variety of Mantra Repetitions for being able to use it. Distinctive worship and rituals and regulations regarding path, sitting mat, and counting rosary aren't advisable for chanting this Hanuman Mantra. The Mantra https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s