The shelf life of CDL can vary, but usually depends on storage conditions and the specific concentration of the solution. If stored in a light-protected container at a cool temperature between 2 and 8°C, CDL can last for several months. However, it is recommended to use the solution within 6 months after preparation to ensure its maximum effectiveness. Over time, the effectiveness of the CDL may decrease, which is why it is advisable to always pay attention to the expiry or manufacturing date and storage recommendations.