How much time would be good to set in expire header for a website?

If your page resources (images/css/js) typically don't change and are static you can set the expires header to something far out like 1 year .

What I do is set the expiry time of CSS and JavaScript files to a high value, like 1 or 5 years. When I change the stylesheets or JS files, I change the version number in their URLs, to prevent stale files from being served from cache.

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