Normally, when a user edits one of my posts, I receive a notification like on the following depending on the case
User has editing privilege (click to visit revision)
Users' edit is submitted to review queue (click to visit review queue)
The above notifications were received instantaneously (or less than 30 minutes, in case caching is supposed to be the answer) as the edit was done/suggested.
But I did not receive any such notification today (yet) on an edit made on my post here. I think it is a possible bug and should be looked at. The recent notifications list I have is shown below: