Dried beans typically require 12 to 24 hours to dry, depending on the initial moisture content and the drying conditions. The drying process is crucial for preserving the beans' shelf life and flavor. The time it takes for beans to dry can vary based on factors such as the type of bean, the starting moisture level, and the ambient temperature and humidity.

The drying process involves reducing the moisture content of the beans to a safe level, which is generally below 10%. This is because beans with higher moisture content are more susceptible to mold and spoilage. The drying time can be influenced by the following factors:

1. Type of Bean: Different types of beans have varying moisture content and drying times. For example, kidney beans may take longer to dry compared to pinto beans due to their size and shape.

2. Initial Moisture Level: Beans with higher initial moisture content will take longer to dry. It's important to ensure that the beans are thoroughly dried to prevent spoilage.

3. Ambient Temperature and Humidity: Higher temperatures and lower humidity can speed up the drying process. Conversely, cooler temperatures and higher humidity can slow it down.

According to the United States Department of Agriculture (USDA), dried beans should be dried to a moisture content of 10% or less. This ensures that the beans are safe to store for an extended period. The USDA also provides guidelines for drying beans, recommending that the beans be spread out in a single layer on a clean, dry surface. The drying time can be monitored by periodically checking the beans for a dry, brittle texture and a lack of stickiness.

In conclusion, drying beans typically takes 12 to 24 hours, but this can vary based on several factors. Proper drying is essential for maintaining the quality and safety of dried beans for long-term storage.