How long can veggie burgers stay unrefrigerated?

It is not recommended to leave veggie burgers unrefrigerated for any period of time. Veggie burgers are typically made with perishable ingredients, such as vegetables and eggs, which can spoil quickly at room temperature. As such, veggie burgers should be refrigerated immediately after purchase and cooked or consumed within the recommended time frame listed on the packaging. Leaving veggie burgers unrefrigerated can increase their risk of bacterial growth and contamination.