As this is the Swyama Siddha Hanuman Mantra it does not have to become chanted for a fixed number of Mantra Repetitions for being able to utilize it. Exclusive worship and rituals and regulations concerning path, sitting mat, and counting rosary are certainly not suggested for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s