While living at the Dojo, I sat Zazen in the Zendo each day. Usually 4 times but often much more. At that time, in my late 20’s, I believed that the amount and length of time spent in Zazen was important. Now I just sit 2 or 3 times a day. I’ve found that the empty or quiet mind comes and goes during each sitting period while the posture remains more or less the same.