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MistaL 40 secs for a average human, with average height, weight and resistances... That would give Goku a minute or two? I think that One Punch Man example should be inserted here somewhere... There's some canon source of how Superman would fare? I'm not a particular fan, so what comes to mind is that in the movies he really fight someone in the moon, while in the DCAU he needed a spacesuit... and in the comics it is something that varies greatly with each author...
Other two other facts of a lot to be reviewed would be the Nyoi-bo travel distance/speed and the fact that indeed Toninjinka was abandoned there with his human minions making the moon in dragon ball have a sort of breathable atmosphere? To much to think about, The REAL world have to many rules...
Now I'm sure that they should loan Superman copyrights to TOEI (or insert your favorite animation studio here...) to make it happen... Since fans will always be fans... they should animate two fights one for each side victory (they did it with Pokemon once I think?)... and let it settle through official dvd sells (or box office sells for that matter)...
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mr. Poneis