I actually do that pretty often myself, since most of the time I don't have much else to do beyond using my computer 16-19 hours a day.
So I usually am able respond to a reply on an old comment of mine within minutes.

…Why do I get the feeling that people who saw this comment are going to make sure to remember it and wait a few months, or even a year, before replying just to see if I reply back in less than an hour?