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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

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

5 minutes ago | parent | next | edit | delete

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

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