As of my last knowledge update in September 2021, a DOT (Department of Transportation) physical is typically valid for up to 24 months for most commercial drivers. However, there are some exceptions and variations in the duration of validity depending on specific health conditions or circumstances. Here are some key points to consider:

1. Most Common Validity Period: A standard DOT physical certificate is valid for up to 24 months (2 years) if you meet all the required medical qualifications.
2. Shorter Validity Period: In some cases, the medical examiner may issue a certificate that is valid for a shorter period of time if you have a medical condition that requires more frequent monitoring or if there are concerns about your fitness to drive.
3. Medical Conditions: If you have certain medical conditions or issues, such as high blood pressure or diabetes, the examiner may issue a certificate with a shorter validity period and request that you provide documentation or undergo more frequent examinations to ensure your continued fitness for driving.
4. Temporary Certificates: In some cases, a driver may be issued a temporary medical certificate that is valid for a limited period, such as 3 months, while they address specific medical concerns or provide additional documentation.

Please note that regulations and guidelines can change, so it's important to check with the Federal Motor Carrier Safety Administration (FMCSA) or your state's Department of Motor Vehicles (DMV) for the most up-to-date information regarding the validity period of DOT physicals. Additionally, your specific circumstances and medical history may also impact the duration of your DOT physical certificate, so it's advisable to consult with a certified medical examiner for personalized guidance.

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