What unit of time is the expiration.

[adam winnipass]

I want to store data for a specific period but am not really sure the unit of time the store method expects
store($key, $data, <$expiration>);
Wondering if the expiration is in seconds, milliseconds. Not really sure

[adam winnipass]

Found it in one of the issue threads.. seconds
$cache->store('hello', 'Hello World!', 60); //60 Seconds