> ## Documentation Index
> Fetch the complete documentation index at: https://hedera-0c6e0218-mintlify-4a9eb0b1.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Duration

> Hedera protobuf reference for the Duration message representing an interval expressed in seconds, used across transactions for auto-renew and validity windows.

A length of time in seconds.

| Field     | Description           |
| --------- | --------------------- |
| `seconds` | The number of seconds |