As that is a Swyama Siddha Hanuman Mantra it doesn't have to become chanted for a set amount of Mantra Repetitions for being able to use it. Particular worship and rituals and rules pertaining to path, sitting down mat, and counting rosary usually are not advisable for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s