You can chant the Hanuman Shabar Mantra as many times as you're feeling relaxed, regardless of whether for a certain variety of repetitions or for a certain duration. हं हं हं अट्टहासं सुरवरनिलयं ऊर्ध्वरोमं करालं Light-weight an oil lamp (diya), which represents the removing of darkness and evil forces. https://www.youtube.com/watch?v=ufkmD95y7fE&t=2s