As this can be a Swyama Siddha Hanuman Mantra it does not have to be chanted for a hard and fast range of Mantra Repetitions for being able to use it. Specific worship and rituals and procedures about course, sitting mat, and counting rosary are not advisable for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s