As this is a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a set number of Mantra Repetitions for having the ability to utilize it. Distinctive worship and rituals and guidelines about way, sitting down mat, and counting rosary usually are not suggested for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s