How long does it take for Amazon to publish a book?

Curious how long Amazon Digital Publishing takes to publish a book? Typically, it’s 24–72 hours after submission, but that can vary. If your files are formatted correctly and your metadata is in order, things usually move quickly. Errors or flagged content might cause delays. I recently published a thriller and it was live in under 36 hours. Others say non-fiction can take longer due to category reviews. Anyone else want to share their timeline? Let’s make this a helpful thread for new authors navigating Amazon's publishing process. Your input could save someone a lot of guesswork!