Time must be guarded. It is urgent to "accept the yoke of Torah." Every bit of time, every day that passes, is not just a day but a life's concern. Days go by; as the Talmud says (Yerushalmi Berachot 1:1), "A day enters and a day departs, a week enters etc.,... a month etc.,... a year etc.,..." My father quoted the Alter Rebbe: A summer day and a winter night are a year.