As this can be a Swyama Siddha Hanuman Mantra it does not have to get chanted for a fixed quantity of Mantra Repetitions for being able to use it. Specific worship and rituals and procedures about direction, sitting mat, and counting rosary aren't advised for chanting this Hanuman Mantra. The https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s