As this is the Swyama Siddha Hanuman Mantra it does not have to generally be chanted for a set range of Mantra Repetitions for being able to utilize it. Exclusive worship and rituals and rules relating to way, sitting down mat, and counting rosary usually are not advisable for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s