$expire = get_field('status_time_duration') + get_the_time('U');  // UNIX time that gets the publish date plus an additional time in seconds

function alerts_opby( $qvars ){ //function to call up the query
$qvars[] = 'opby_alerts';
return $qvars;
}
add_filter( 'query_vars', 'alerts_opby' );

function opby_query( $query ) { //pre_get_posts functions
if (isset( $query->$qvars['opby_alerts'] )) {
    $expire = get_field('status_time_duration') + get_the_time('U');
    $current = date( 'U', current_time( 'timestamp', 0 ) );
    $query->set('tax_query', array(array('taxonomy' => 'post_format','field' => 'slug','terms' => array( 'post-format-status' ),'operator'=> 'IN'),
),'meta_query', [
    'relation' => 'OR',
    [
     'key'     => 'status_time_duration',
     'value'   => $expire,
     'compare' => '<=',
     'type'    => 'NUMERIC',
    ],
    [
     'key'     => 'status_time_duration',
     'compare' => 'NOT EXISTS',
    ],
],
    $query->set('posts_per_page', -1));
}
return $query;
}
add_action( 'pre_get_posts', 'opby_query' );

$expire = get_field( 'status_time_duration' ) + get_the_time( 'U' );

'meta_query', [
    'relation' => 'OR',
    [
        'key'     => 'status_time_duration',
        'value'   => date( 'U' ),
        'compare' => '<=',
        'type'    => 'NUMERIC',
    ],
    [
        'key'     => 'status_time_duration',
        'compare' => 'NOT EXISTS',
    ],
],