Time is a boundary, a container. How do you fill the space? How do you fill your time? Learn to use time to your advantage by knowing how to speed time up when you want something to be over with and slow time down when you want to amplify the moment.
Every inhale is a response of the sympathetic nervous system and every exhale is one of the parasympathetic nervous system. When we practice breathing with an equal inhale and exhale, we give ourselves the experience of equanimity in the nervous system.