expires 30m;

I'm extrapolating this from
http://translate.google.com/translate?js=y&prev=_t&hl=en&ie=UTF-8&layout=1&eotf=1&u=http://sysoev.ru/nginx/docs/http/ngx_http_headers_module.html&sl=ru&tl=en

which gives an absolute example as

expires @15h30m;

On Fri, Dec 4, 2009 at 4:01 PM, nerdgrind <nginx-forum@nginx.us> wrote:
> I have seen expires in hours (h), days (d), and max. How do I write an expire in 30 minutes? Is there a link to resource that lists all the expire options?
>
> Posted at Nginx Forum: http://forum.nginx.org/read.php?2,27883,27883#msg-27883
>
>
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