> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cdp.coinbase.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Duration

```ts theme={null}
type Duration = number | string;
```

Defined in: [guardrails/types.ts:40](https://github.com/coinbase/cdp-sdk/blob/a1195adcfa5a93627bd3cb79831b188cc13073a1/typescript/packages/cdp-sdk/src/x402/guardrails/types.ts#L40)

A duration expressed as either a number of milliseconds or one of the
shorthand strings: `"500ms"`, `"30s"`, `"5m"`, `"1h"`, `"24h"`, `"7d"`.