Most days I run out of delete votes somewhere in the middle of the Low Quality Posts queue.
I have noticed what seems to me to be a (minor) bug here.
When I get to my last delete vote, if I click the Delete button and then Delete again in the comment dialog, I get a little red error pop up saying:
An error occurred while reviewing this item
I refresh the page, and I get this:
So, it looks like I cannot review this item at all.
Edit: However, as pointed out in the comments, it appears that the delete vote landed. A bit annoying, but not as bad as I first thought.