Every day requires Mitzvos to be performed:

A cryptic Zoharic statement: The Zohar explains the verse “Veavraham Zakein Ba Bayamim” to mean that Avraham was satiated with his days, that each day contained its garments of Mitzvos which Avraham had completed. The Zohar concludes: Woe onto the man who has decreased his days, as a day with a blemish is a day without a garment, as above in heaven they garb him in these garments.

The intent: The intent of the statement of the Zohar is as follows: After death, the souls which eventually make it to the garden of Eden receive their pleasure and reward from basking in the Ray of the Divine presence. Now, being that the soul is a limited creation, he cannot receive directly from the divine Ray without it being led to expiration and essential nonexistence. To prevent this from occurring, G-d created garments for the soul to protect it from the intensity of his Divine rays and allow the souls to receive a measured experience of Divinity which allow it to receive immense pleasure and at the same time retain its existence. What are these soul garments made of? The Mitzvos that one performs in this world. Every mitzvah that one performs becomes the garment for his soul in the garden of Eden. Now, every day of life in this physical world contains a special divine mission for one’s soul and if a vacation day was taken from one’s divine service and was absent the fulfillment of Mitzvos, then that day is lacking its garment with which the soul is to be garbed in, in the garden of Eden. It does not suffice to simply do two Mitzvos the next day as a makeup, as every day has its specific required Mitzvos that cannot be made up. This then was the greatness of Avraham Avinu, that he did not lack even one day from his divine service and hence all of his garments were complete.