Most SE sites allow users with the Cast Close & Reopen Votes privilege to cast 24 close votes per day. This is the case on TeX.SE. This corresponds to the total number of posts you can vote to close in one day, including in reviews and outside of reviews.
Unless the Close Votes review queue is overflowing, you can perform up to 20 close vote reviews per day. This is not the number of posts you can vote to close; this is the number of reviews you can perform in the review queue. If any review queue is overflowing (meaning the number of posts in the queue exceeds a certain threshold), your daily limit is increased to 40 while the queue is overflowing; this limit returns to 20 when it is no longer overflowing.
On Stack Overflow, users can cast up to 50 close votes every day rather than 24 like most sites. Additionally, the Close Votes queue has been overflowing for a very long time (as of writing this answer there are almost 4800 posts in the queue), increasing the maximum daily CV reviews to 40, unless/until a miracle occurs and the queue stops overflowing.
Completing a Close Votes review only uses up a close vote if you select the Close option; Edit, Leave Open, and Skip do not result in using up a close vote. Casting a close vote outside a review queue does not affect your daily review count. Thus, it is very possible to use up your daily reviews and still have close votes remaining, or use up your daily close votes before completing the maximum number of daily reviews.