How did the Harry Potter series manage to release its 8 movies in just 10 years?

Looking at the turn around for movies today it seems absolutely incredible that a series with such complex set design, use of graphical effects, a heavily child cast, and pressure was able to pump out genuinely decent movies at that pace. Sure there were books to base the writing on but everything else alone is a lot of heavy lifting. Any insights?

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Official Posters for ‘The Hunger Games: Sunrise on the Reaping’

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