Index: src/wp-admin/includes/class-wp-upgrader.php =================================================================== --- src/wp-admin/includes/class-wp-upgrader.php (revision 25052) +++ src/wp-admin/includes/class-wp-upgrader.php (working copy) @@ -347,7 +347,8 @@ if ( $enable ) { $this->skin->feedback('maintenance_start'); // Create maintenance file to signal that we are upgrading - $maintenance_string = ''; + $timeout = apply_filters( 'upgrader_maintenance_mode_timeout', 600 ); + $maintenance_string = ''; $wp_filesystem->delete($file); $wp_filesystem->put_contents($file, $maintenance_string, FS_CHMOD_FILE); } else if ( !$enable && $wp_filesystem->exists($file) ) { Index: src/wp-includes/load.php =================================================================== --- src/wp-includes/load.php (revision 25052) +++ src/wp-includes/load.php (working copy) @@ -145,11 +145,15 @@ if ( !file_exists( ABSPATH . '.maintenance' ) || defined( 'WP_INSTALLING' ) ) return; - global $upgrading; + global $upgrading, $timeout; include( ABSPATH . '.maintenance' ); - // If the $upgrading timestamp is older than 10 minutes, don't die. - if ( ( time() - $upgrading ) >= 600 ) + + if ( empty( $timeout ) ) + $timeout = 600; // Default of Ten minutes maximum for maintenance mode, overridden in .maintenance + + // If the $upgrading timestamp is older than $timeout seconds, don't die. + if ( ( time() - $upgrading ) >= $timeout ) return; if ( file_exists( WP_CONTENT_DIR . '/maintenance.php' ) ) { @@ -164,7 +168,7 @@ $protocol = 'HTTP/1.0'; header( "$protocol 503 Service Unavailable", true, 503 ); header( 'Content-Type: text/html; charset=utf-8' ); - header( 'Retry-After: 600' ); + header( 'Retry-After: ' . $timeout ); ?> >