Limit of supes
It seems to me that Superman, in his various incarnations, is most def the single greatest comic character there is. Now that is not an easy thing to say considering I'm a true Marvelite, but one can't deny comic canon feats. So I'm wondering if you take the most powerful variant of superman (pc I believe) and did the old sundip trick for as long as it took, what level of power would be able to defeat him? Or should I ask, which super cosmic would he be capable of defeating?
Surtur
Spector
Galactus
any Celestial
These are just a few possibles.