As this can be a Swyama Siddha Hanuman Mantra it doesn't have to generally be chanted for a fixed quantity of Mantra Repetitions for being able to use it. Specific worship and rituals and procedures relating to way, sitting down mat, and counting rosary will not be suggested for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s