The time it takes to charge solar lights can vary depending on several factors, including the type and capacity of the solar lights' batteries, the intensity and duration of sunlight exposure, and any additional charging features the lights may have. Generally, solar lights require several hours of direct sunlight to reach a full charge. For instance, some solar lights may take around 8 hours of direct sunlight to fully charge, while others may need more or less time. It's always best to consult the specific instructions provided with your solar lights for the most accurate charging information.