As this can be a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a set number of Mantra Repetitions for having the ability to use it. Exclusive worship and rituals and regulations about route, sitting down mat, and counting rosary will not be advisable for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s