i'm using w3 cache and when i check page speed at gtmatrix they suggest this for minified files
The following cacheable resources have a short freshness lifetime. Specify an expiration at least one week in the future for the following resources:
/wp-content/cache/minify/000000/M9QvyMzOySwu0S9ILCop1s8CosLS1KJKvZLM3NSAzOTs1CK93Mw8AA.js (3 seconds)
how to increase this to one week