As this can be a Swyama Siddha Hanuman Mantra it doesn't have to be chanted for a set range of Mantra Repetitions for with the ability to utilize it. Particular worship and rituals and rules about course, sitting down mat, and counting rosary are usually not recommended for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s