A hundred and fifty years later!
In the Sorcerer World, "a hundred and fifty years" would carry different meanings in various time and dimensions.
To a normal healthy human in the Sorcerer World, "a hundred and fifty years" was basically his entire lifetime. This was Old Ham's entire lifetime too.
To the sorcerer academies in each of the tower regions, "a hundred and fifty years" was one and a half round of the Holy Tower Qualification Battle. During this period of time, countless other gifted apprentices, like "Ice Age", "Bell-sound Dictator" emerged too.
Nonetheless, to some full-fledged sorcerers "a hundred and fifty years" was nothing but a short amount of time that could come to pass just by running one experiment. In the eyes of these real sorcerers, these boastful, conceited top-ranked apprentices were just a bunch of kids who were fooling around. Every sorcerer had such an experience when they were younger. Thus, most of them would respond to all of this with a smile.