As this is a Swyama Siddha Hanuman Mantra it doesn't have to generally be chanted for a set amount of Mantra Repetitions for having the ability to utilize it. Exclusive worship and rituals and principles with regards to path, sitting mat, and counting rosary are usually not recommended for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s