« first day (1886 days earlier)      last day (3114 days later) » 

00:25
Yay!
Thank you!
 
6 hours later…
user61389
06:25
:)
09:29
Never to be freezed again =) Power in action, don't forget to hail the mighty ones ;)
 
7 hours later…
16:30
So, a lot of the time there's a non-zero number beside the "review" button for me, yet when I click it there's nothing for me to review - what does the number indicate when this is happening?
 
2 hours later…
18:30
Good question indeed, I've asked this myself. Perhaps this is fitting Meta? My only idea has been that it relates to moderator-only tasks (e.g. flags).
One thing I noticed is that there was two review tasks, one under "first post" and another under a different heading, while the review number was 13. I reviewed the first post, it turned out the second review task was the same post under a different heading so it disappeared, but the number only went down by one to 12.
19:33
Review items can be reviewed only by a certain number of users (for edits I know it's 2), and when that number of users review the item, it disappears for others.
Also, like you said, a post can only be reviewed once by the same user. You sometimes get a combination e.g. of 'late answer' and 'first post' for the same post and you can only review one of them.

« first day (1886 days earlier)      last day (3114 days later) »