As that is a Swyama Siddha Hanuman Mantra it does not have to become chanted for a hard and fast quantity of Mantra Repetitions for being able to use it. Exclusive worship and rituals and regulations relating to path, sitting mat, and counting rosary aren't recommended for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s