As this is the Swyama Siddha Hanuman Mantra it does not have to be chanted for a fixed number of Mantra Repetitions for being able to use it. Unique worship and rituals and regulations about route, sitting down mat, and counting rosary will not be advised for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s