The time it takes to see sales on KDP varies based on several factors. Factors such as book visibility, marketing and promotion, book quality and reviews, market dynamics, and ongoing author efforts all influence the timeline. Some authors may see sales shortly after publishing their book, while others may experience a longer timeframe. Gaining visibility, accumulating positive reviews, and effectively marketing the book are essential for generating sales. External factors, like seasonal trends and current events, can also impact sales. It's important for authors to set realistic expectations, remain persistent in marketing efforts, and focus on building a readership for long-term success on Amazon KDP.