Your points are noted. Future posts will not have this issue.
We're going to need more information to go on. Can you tell from the alert what that thread is trying to do (or last did)? Have you run this particular alert before or not? If you haven't run the alert, have you tested how long it takes to download the view(s) that are used by the alert (i.e. the trigger view plus any/all view(s) used as content references)?
My guess here is that there's a particular view that is taking multiple minutes to render and/or download.