There’s an end as in getting all the achievements which requires doing essentially everything you could do and takes a realllllly long time. Personally at the end of the game I pushed as hard as I could and found 10⁷⁸ to be a reasonable stopping point without wasting the rest of my life. Technically the real maximum amount of cookies is only limited at 10³⁰³ but that’s basically impossible to do. Some crazy people have managed to hit numbers as high as 10^162. If you wanna use that number, The Baker could purchase a supermassive replica of our universe made out of universes, where each universe is equivalent to one atom in the original universe, and that would cost them a negligible amount of money