In most cases, the ads are approved in a short span of time. However, it might take up to 24 hours for your ads to be approved by FB. If you need to go live in as soon as possible, and the ads are not getting approved, the fastest way to solve this problem is to clone the creatives and assign them to the ads again.
After that, the review process will restart. If the ads don't get approval again in 24 hours, you can get in touch with the support team to investigate the reason of this outcome. 

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