As this can be a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a hard and fast amount of Mantra Repetitions for with the ability to use it. Particular worship and rituals and guidelines pertaining to path, sitting mat, and counting rosary aren't advised for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s