As this can be a Swyama Siddha Hanuman Mantra it doesn't have to get chanted for a fixed amount of Mantra Repetitions for having the ability to use it. Unique worship and rituals and guidelines relating to course, sitting mat, and counting rosary usually are not proposed for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s