Seriously? It's just bread. People act like a few extra hours on the counter is some kind of baking magic. My old roommate did a 48 hour thing once and it just made the kitchen smell weird. Tasted like regular sourdough to me.
Saw a baker on YouTube talk about how those super long ferments really change the yeast activity (like, the balance of different microbes). They said after 48 hours you get more acetic acid, which is that sharper, tangier flavor. Makes sense why yours tasted nuttier and more open.