As that is a Swyama Siddha Hanuman Mantra it does not have to be chanted for a fixed variety of Mantra Repetitions for having the ability to utilize it. Special worship and rituals and guidelines with regards to course, sitting mat, and counting rosary aren't proposed for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s