Adam Clarke on Luke 15:13

Not many days after - He probably hastened his departure for fear of the fine which he must have paid, and the reproach to which he must have been subjected, had the matter come before the civil magistrate. See above.

Riotous living - Ζων ασωτως, in a course of life that led him to spend all: from α not, and σωω I save. And this we are informed, Luk 15:30, was among harlots; the readiest way in the world to exhaust the body, debase the mind, ruin the soul, and destroy the substance.