[happytoexplain]

I think it's a bot? There's an identical version of this comment in another reply, except it cuts off half way through a sentence.

[rdme]

I hit reply on the wrong post and you can't delete comments or at least I don't see how it can be done

[dgb23]

Above the comments I've written on HN I see:

5 minutes ago | parent | next | edit | delete

[hxugufjfjf]

That only lasts for a few minutes until it’s locked and you can no longer delete after that.

[eqvinox]

It lasts 2 full hours, at least for edit. Delete stops working when someone replies afaik.