There is a two hour edit window. Deleting comments is what is removed when a reply is made https://github.com/minimaxir/hacker-news-undocumented/blob/master/R

There is a two hour edit window. Deleting comments is what is removed when a reply is made https://github.com/minimaxir/hacker-news-undocumented/blob/master/README.md#editdelete-time-limits https://github.com/minimaxir/hacker-news-undocumented/blob/m...