This has appeared as the dropdown on my review queue button today:
I can't find out anything about it.
- What does it mean?
- Why aren't there any review queues available to me?
- How long it's going to stay there?! :(
You had too many bad / rejected reviews. This oftentimes is the result of failing the one's Stackoverflow places in the review queues to test your attention.
To see when your ban will be lifted visit the Review Overview page.
I discovered this week that there is one more situation where this happens: if you exhaust your daily vote limit. As soon as you do this, the review queues close, at least the basic ones that are available to lower-reputation users. I suspect this is the case because one of the preferred tasks you can perform in most review queues is to upvote or downvote posts.
The advice in the accepted answer ("review more carefully") is not actionable.
To uncover something actionable I went to the review page as referenced in many comments here. That page showed one bad edit, not many, and that the ban was for four days, not one hour.
When I looked into it a little more more I found that on that review I and one other reviewer had said "Looks OK", but three others said "Requires Editing".
Actionable advice: err on the side of enforcing high-quality posts, which is what all the guidance says. In my particular case I'll be more inclined to vote "Requires Editing", which I now realize I haven't used very often.