Link expired fast after applied filter to extend the nonce time

I want to extend the nonce time to 7 days. And I used the filter provided

add_filter( 'ppp_nonce_life', 'my_nonce_life' );
function my_nonce_life() {
    return 60 * 60 * 24 * 7; 
}

The problem is the preview link expired even faster. Like few hours, the post already expired.

Any idea why???