As it is a Swyama Siddha Hanuman Mantra it does not have being chanted for a fixed range of Mantra Repetitions for having the ability to utilize it. Unique worship and rituals and principles pertaining to route, sitting mat, and counting rosary are usually not advised for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s