As that is a Swyama Siddha Hanuman Mantra it does not have to be chanted for a fixed quantity of Mantra Repetitions for being able to use it. Specific 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