I think the time is still that weird compromise between people who loved the old boards thing and people who wanted editing. I did find this old thread about it
Anyway, I don’t really see why it shouldn’t be longer, although what I would say is that once a load of people have seen your post editing it could easily be missed so the reply-to-your-own-post thing is still a good option.
I mean I frequently find myself questioning this if I’m trying to clarify a post I just made in reply to someone and I can see them replying at the same time 