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

# Timeframe

Restrict when a session function can be called. Attach the policy at the function level.

Examples on this page use `@rhinestone/sdk`, where `rhinestone` is the `RhinestoneSDK` instance from [Create a session with a custom setup](/wallets/session-keys/custom-setup/create-a-session).

```ts {16-17} theme={null}
import { erc20Abi } from "viem";
import { base } from "viem/chains";

const session = await rhinestone.createSession({
  chain: base,
  owners: {
    type: "ecdsa",
    accounts: [sessionOwnerAccount],
  },
  permissions: [
    {
      abi: erc20Abi,
      address: usdcAddress,
      functions: {
        transfer: {
          validAfter: new Date(),
          validUntil: new Date(Date.now() + 1000 * 60 * 60 * 24),
        },
      },
    },
  ],
});
```

This limits the function to a 24-hour window.