How long does it take a review to be approved?

Less than 24 hours. You'll get an email. Check your spam folder.

All day every day

Reviews are approved very quickly. It should be approved in the time Liwet mentioned.

With TUSCL members approving reviews they can get approved very quickly. I have had some approved in less than an hour. Everyone should do their part to read and approve the reviews that are posted for review. Be critical when you review them though. There is nothing wrong with a short succinct review, but if it contains no useful information, then it should be rejected and the reviewer told why. I have noticed that there appear to be more reviews posted under the wrong club than when Founder approved them, so be careful when you post and don’t be afraid to reject reviews that appear to be for the wrong club.

What happens if you put in multiple reviews do you get like 2 months for 2 reviews at once?

If you review two different clubs yes. If you post 2 reviews for the same club within 30 days you don't get credit for the 2nd one.

You'll also get a notification that you won't get the VIP benefits, so if you really want to rig the system, just wait until your VIP status ends to post the additional review. Unless you're clubbing on a holiday, only the day of the week matters, not the day of the month, so posting in April about a visit in February shouldn't be too harmful.