As this is the Swyama Siddha Hanuman Mantra it does not have to generally be chanted for a set number of Mantra Repetitions for having the ability to utilize it. Distinctive worship and rituals and rules concerning path, sitting mat, and counting rosary usually are not advisable for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s