As that is a Swyama Siddha Hanuman Mantra it doesn't have to become chanted for a hard and fast number of Mantra Repetitions for with the ability to utilize it. Specific worship and rituals and policies about way, sitting mat, and counting rosary are certainly not suggested for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s