As this is the Swyama Siddha Hanuman Mantra it does not have to be chanted for a set variety of Mantra Repetitions for being able to use it. Special worship and rituals and policies pertaining to course, sitting mat, and counting rosary usually are not advised for chanting this Hanuman https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s