Talk:Saitama/@comment-83.233.111.243-20190423211119/@comment-203.54.25.60-20190606072513

Wildbow stated with a word of god post that Saitama could one punch destroy Leviathan, a physics breaker monster whose hardness doubles every inch inward. The effective mass of this creature is half  the Milky Way as calculated by fans and the only reason Leviathan taking a step doesn't wreck stuff is because of shenanigans due to spoilers.

So it definitely depends on the writer, but according to at least one, it's half a galaxy in one punch, easy!