How long can you leave tomato juice unrefrigerated?

It is not advisable to leave tomato juice unrefrigerated for an extended period of time. Tomato juice is a perishable product and is susceptible to spoilage from microorganisms such as bacteria and yeast. The optimal temperature for storing tomato juice is below 40°F (4°C). Leaving tomato juice unrefrigerated, especially for several hours or overnight, can increase the growth of spoilage microorganisms and compromise its safety and quality.