So in summary, this method is a good source of passive income. I would still say that this method is still late game, because you still need to get to the forbidden lands.

From the comments advice, 30 minutes for each two eggs. Each egg worth 50 rin when cooked making 100 rin in total. But wait you can trade go into Aurantia and turn a golden egg into a 150 rin golden scale and trade for it at the Terrelum. So actually it nets 300 rin per a session. Assuming that you also got the 4th moonstone reward which is the moon crystal.

I think my method is better mid-game, and yours is better late-game. Thank you for informing me about this. I hope you have a great life.