As this can be a Swyama Siddha Hanuman Mantra it doesn't have for being chanted for a fixed range of Mantra Repetitions for being able to use it. Particular worship and rituals and policies pertaining to course, sitting mat, and counting rosary usually are not suggested for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s