As this is the Swyama Siddha Hanuman Mantra it doesn't have to get chanted for a hard and fast amount of Mantra Repetitions for having the ability to use it. Special worship and rituals and guidelines relating to route, sitting mat, and counting rosary are certainly not advisable for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s