As that is a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a hard and fast range of Mantra Repetitions for with the ability to utilize it. Unique worship and rituals and procedures relating to way, sitting mat, and counting rosary are usually not advised for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s