As this can be 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 utilize it. Special worship and rituals and procedures pertaining to path, sitting down mat, and counting rosary aren't suggested for chanting this https://www.youtube.com/watch?v=ufkmD95y7fE&t=32s