diff -r 3d4e9c994f10 -r a86126ab1dd4 wp/wp-includes/class-wp-recovery-mode-cookie-service.php
--- a/wp/wp-includes/class-wp-recovery-mode-cookie-service.php	Tue Oct 22 16:11:46 2019 +0200
+++ b/wp/wp-includes/class-wp-recovery-mode-cookie-service.php	Tue Dec 15 13:49:49 2020 +0100
@@ -3,7 +3,7 @@
  * Error Protection API: WP_Recovery_Mode_Cookie_Service class
  *
  * @package WordPress
- * @since   5.2.0
+ * @since 5.2.0
  */
 
 /**
@@ -35,10 +35,20 @@
 
 		$value = $this->generate_cookie();
 
-		setcookie( RECOVERY_MODE_COOKIE, $value, 0, COOKIEPATH, COOKIE_DOMAIN, is_ssl(), true );
+		/**
+		 * Filter the length of time a Recovery Mode cookie is valid for.
+		 *
+		 * @since 5.2.0
+		 *
+		 * @param int $length Length in seconds.
+		 */
+		$length = apply_filters( 'recovery_mode_cookie_length', WEEK_IN_SECONDS );
+		$expire = time() + $length;
+
+		setcookie( RECOVERY_MODE_COOKIE, $value, $expire, COOKIEPATH, COOKIE_DOMAIN, is_ssl(), true );
 
 		if ( COOKIEPATH !== SITECOOKIEPATH ) {
-			setcookie( RECOVERY_MODE_COOKIE, $value, 0, SITECOOKIEPATH, COOKIE_DOMAIN, is_ssl(), true );
+			setcookie( RECOVERY_MODE_COOKIE, $value, $expire, SITECOOKIEPATH, COOKIE_DOMAIN, is_ssl(), true );
 		}
 	}
 
@@ -83,13 +93,7 @@
 			return new WP_Error( 'invalid_created_at', __( 'Invalid cookie format.' ) );
 		}
 
-		/**
-		 * Filter the length of time a Recovery Mode cookie is valid for.
-		 *
-		 * @since 5.2.0
-		 *
-		 * @param int $length Length in seconds.
-		 */
+		/** This filter is documented in wp-includes/class-wp-recovery-mode-cookie-service.php */
 		$length = apply_filters( 'recovery_mode_cookie_length', WEEK_IN_SECONDS );
 
 		if ( time() > $created_at + $length ) {