As it is a Swyama Siddha Hanuman Mantra it does not have for being chanted for a set variety of Mantra Repetitions for having the ability to use it. Special worship and rituals and principles pertaining to direction, sitting mat, and counting rosary are not proposed for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s