hi Alessandro, yes its not real time. and it cache 1 days. why would you need it real time?
we can make it real time if you want to, but your server will always do request to facebook server everytime people look at your website, its mean your website will get very heavy because it will need to contact facebook before they your customer get their page.
if you want to reduce how long it take to reduce cache, we also can provide you the code.