As that is a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a hard and fast variety of Mantra Repetitions for with the ability to use it. Special worship and rituals and regulations relating to way, sitting down mat, and counting rosary aren't suggested for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s