Check codex info about Nonces life time here.
Here is a quick code that will echo life time of nonces in footer of your site’s front-end as html comment. Put it in your functions.php file.
$n = "";
add_filter('nonce_life', 'wptuts_change_nonce_hourly');
function wptuts_change_nonce_hourly( $nonce_life ) {
global $n ;
$n = $nonce_life;
return $nonce_life;
}
// Display in footer comments
add_filter("wp_footer","d");
function d(){
global $n;
echo "<!- Nonce Life =". $n ."-->";
}
NOTE: This code does not give the ideal way to check life time of nonce, but a quick fix to get the desired info. You should delete this code from functions.php once you get the info.
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