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