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Cache::set() allows you to temporarily override a cache configs settings for one operation (usually a read or write). If you use Cache::set() to change the settings for a write, you should also use Cache::set() before reading the data back in. If you fail to do so, the default settings will be used when the cache key is read.

Cache::set(array('duration' => '+30 days'));
Cache::write('results', $data);

// Later on

Cache::set(array('duration' => '+30 days'));
$results = Cache::read('results');

1. Cache::set(array('duration' => '+30 days'));
2. Cache::write('results', $data);
3. // Later on
4. Cache::set(array('duration' => '+30 days'));
5. $results = Cache::read('results');

If you find yourself repeatedly calling Cache::set() perhaps you should create a new Cache configuration. This will remove the need to call Cache::set().