As it is a Swyama Siddha Hanuman Mantra it doesn't have being chanted for a set variety of Mantra Repetitions for having the ability to use it. Specific worship and rituals and regulations with regards to course, sitting down mat, and counting rosary are usually not recommended for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s