As a culinary expert with a focus on confections, I can tell you that the time it takes for chocolate to set in the fridge can vary depending on several factors, including the type of chocolate, its temperature, and the size of the piece you're working with.
Generally, chocolate will start to set within about 30 minutes in the refrigerator, but it can take up to 2 hours for it to fully harden. The colder the chocolate is when you put it in the fridge, the faster it will set. For instance, if you've tempered the chocolate beforehand, it will set more quickly than if you've just melted it.
To ensure even setting, it's important to place the chocolate on a flat surface in the fridge and avoid opening the fridge door too frequently, as temperature fluctuations can affect the setting process.
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