How long does it take for lemon tree to turn lemons yellow?

Lemons take different amounts of time to turn yellow, depending on the variety of the tree and the growing conditions. Generally, it can take anywhere from 6 to 12 months for a lemon to turn from green to yellow. Some varieties, such as the Meyer lemon, may take as little as 4 months, while others, such as the Eureka lemon, may take up to 18 months. Factors such as the amount of sunlight, water, and fertilizer the tree receives can also affect the time it takes for lemons to turn yellow.