If I recall correctly a couple of month ago every like was notified instantly, sometimes multiple likes bundled into one notification, if they were done in a short amount of time I suspect.

But today I made a comment, for which I received 1 like notification, I then went to the comment itself and had around 5 likes.

I'm kinda curious on hoe it is managed, as I could not find info about this in the FAQs.

Cheers, have a nice day!