As this is a Swyama Siddha Hanuman Mantra it does not have to be chanted for a fixed number of Mantra Repetitions for being able to use it. Special worship and rituals and rules regarding route, sitting down mat, and counting rosary aren't encouraged for chanting this Hanuman Mantra. The https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s