As that is a Swyama Siddha Hanuman Mantra it does not have to get chanted for a set amount of Mantra Repetitions for being able to utilize it. Particular worship and rituals and rules concerning way, sitting down mat, and counting rosary are not suggested for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s