Hack has the `<<__Memoize>>` attribute to easily cache method results.

How can I use it to cache results of some database or API request for a **limited amount of time**?

Let's say my code very frequently needs some information from a database:

```
public function loadEmployees(
  string $company_name,
): ImmSet<string> {
  return $this->db->sqlQuery(...);
}

```

To improve performance, I'd like to cache the results for one minute.

If the data changes my program should see it within a minute. I'm fine with the results being stale for one minute. 

Checked the [official docs](https://docs.hhvm.com/hack/attributes/special#__memoize).