As this is a Swyama Siddha Hanuman Mantra it does not have to get chanted for a hard and fast quantity of Mantra Repetitions for having the ability to utilize it. Exclusive worship and rituals and rules with regards to way, sitting mat, and counting rosary aren't advisable for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s