As that is a Swyama Siddha Hanuman Mantra it doesn't have to get chanted for a set number of Mantra Repetitions for being able to utilize it. Distinctive worship and rituals and procedures regarding way, sitting down mat, and counting rosary usually are not advisable for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s