Class 1 Medical Assessments are valid for one year for individuals under the age of 60 in Multi-crew Commercial Air Transport Operations and six months for individuals over the age of 40 in Single Crew Commercial Air Transport Operations.
List of DGCA Examiners and Class 1 Medical Centers
https://rb.gy/cpfdrxList of DGCA empanelled Class 2 doctors
https://www.dgca.gov.in/digigov-portal/?page=jsp/dgca/InventoryList/personal/ medical/class2/class2.pdfClass 2 has a validity period of 24 months.