# TTL Expression Syntax

The following table includes a list of TTL expressions: 

| Custom expiration syntax examples | Description                                                                 |
| --------------------------------- | --------------------------------------------------------------------------- |
| `30m`                             | Expires after 30 minutes.                                                   |
| `24h`                             | Expires after 24 hours.                                                     |
| `5d`                              | Expires after 5 days.                                                       |
| `1w`                              | Expires after 1 week.                                                       |
| `3M`                              | Expires after 3 months (3\*30 days).                                        |
| `1y`                              | Expires after 1 year (365 days).                                            |
| `modified +24h`                   | Calculate 24 hours since modification time, and set expiration accordingly. |