InstantCommons[1] which is just a shortcut for ForeignFilesRepo[2] was
introduced in 1.16.0[1] where as FFR has been around since 1.11.0[2].
Which means it would be manually configured since you mention 1.14.x,
If the person used the default settings we show it should be set for
12 hours.
The example we show on wiki[3]:
$wgForeignFileRepos[] = array(
'class' => 'ForeignAPIRepo',
'name' => 'shared',
'apibase' => 'http://commons.wikimedia.org/w/api.php',
'fetchDescription' => true, // Optional
'descriptionCacheExpiry' => 43200, // 12 hours, optional (values are seconds)
'apiThumbCacheExpiry' => 43200, // 12 hours, optional, but required for local
thumb caching
);
[1].
http://www.mediawiki.org/wiki/Manual:$wgUseInstantCommons
[2].
http://www.mediawiki.org/wiki/Manual:$wgForeignFileRepos
[3].
http://www.mediawiki.org/wiki/Manual:$wgForeignFileRepos#Using_files_from_W…