As this can be a Swyama Siddha Hanuman Mantra it doesn't have for being chanted for a hard and fast number of Mantra Repetitions for being able to use it. Distinctive worship and rituals and rules concerning direction, sitting mat, and counting rosary aren't suggested for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s