As this is the Swyama Siddha Hanuman Mantra it doesn't have to be chanted for a fixed amount of Mantra Repetitions for having the ability to utilize it. Special worship and rituals and guidelines concerning path, sitting mat, and counting rosary aren't advisable for chanting this Hanuman Mantra. The Mantra https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s