Did I *just* get my first reply?

I just got a reply on a comment I made about an hour ago.. and I got it so much later than I typically get replies.. Usually, I get replies straight away. But this person has replied to a comment I made an hour ago and I can see that they have liked it as well!<br><br>So then I started thinking, are comments only visible for an hour? Like, could I have unintentionally liked/loved someone's comment an hour in? I like to be an *online friend* if you will, and I always make an effort to respond to the comments I see and like/loved every single one. But if that's the case, I must have missed so many of them. I'm just so confused. Can someone please tell me what is going on.. as I am genuinely baffled.