Over-dimensional cargo (ODC) gets one day per 20 km. The clock starts at the first Part-B entry, and validity can be extended if the consignment is still in transit.
Note
Rules can change through GST notifications. Always confirm the current position on ewaybillgst.gov.in or with a tax professional for your specific case.
Related: all FAQs, the complete guide, and the validity guide.
Frequently asked questions
When does the validity clock start?
From the date and time Part-B (vehicle details) is first entered, not from Part-A.
Can validity be extended?
Yes — if goods are still in transit, validity can be extended within the allowed window before/after expiry.