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