As it is a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a hard and fast quantity of Mantra Repetitions for having the ability to use it. Exclusive worship and rituals and policies relating to way, sitting down mat, and counting rosary will not be recommended for chanting https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s