As it is a Swyama Siddha Hanuman Mantra it doesn't have to get chanted for a hard and fast variety of Mantra Repetitions for having the ability to utilize it. Particular worship and rituals and rules concerning direction, sitting down mat, and counting rosary usually are not recommended for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s