As this can be a Swyama Siddha Hanuman Mantra it doesn't have to be chanted for a set amount of Mantra Repetitions for being able to use it. Specific worship and rituals and procedures pertaining to direction, sitting down mat, and counting rosary aren't proposed for chanting this Hanuman Mantra. https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s