It's an interesting new type of brag. It roughly means: "I want you to know how advanced I am at using LLMs, and how AI-first I am. So here is how little time I spent, to prove that I am using LLMs as much as possible, demonstrating that I am ahead of the curve on this new trend"
I typically interpret it as an excuse, not a selling point.
it was by no means low effort
Isn't 60 hours by definition low effort? Setting an LLMs effort value to high doesn't count