---
name: TTL
parameters:
  - ttl
parameter_types:
  ttl: Duration
---

TTL sets the TTL for a single record only. This will take precedence
over the domain's [DefaultTTL](../domain/DefaultTTL.md) if supplied.

The value can be:

  * An integer (number of seconds). Example: `600`
  * A string: Integer with single-letter unit: Example: `5m`
  * The unit denotes:
    * s (seconds)
    * m (minutes)
    * h (hours)
    * d (days)
    * w (weeks)
    * n (nonths) (30 days in a nonth)
    * y (years) (If you set a TTL to a year, we assume you also do crossword puzzles in pen. Show off!)
    * If no unit is specified, the default is seconds.
  * We highly recommend using units instead of the number of seconds. Would your coworkers understand your intention better if you wrote `14400` or `'4h'`?

```javascript
D('example.com', REGISTRAR, DnsProvider('R53'),
  DefaultTTL(2000),
  A('@','1.2.3.4'), // uses default
  A('foo', '2.3.4.5', TTL(500)), // overrides default
  A('demo1', '3.4.5.11', TTL('5d')),  // 5 days
  A('demo2', '3.4.5.12', TTL('5w')),  // 5 weeks
);
```