Depending on the circumstances, we can allow unlimited time to edit a single post. This is typically done when you are "hosting" a run and need to constantly update the information concerning the run.
If you need some changes made to a post you can either do as GoldenSahara00 mentioned or you can use the "Report Post" button located under your avatar. This will alert all moderators that something is up. When prompted by the reason for report window, just let us know what you would like fixed