diff --git a/lib/Cron/CronHelper.php b/lib/Cron/CronHelper.php
index 9794b14f4e..bc073a6d85 100644
--- a/lib/Cron/CronHelper.php
+++ b/lib/Cron/CronHelper.php
@@ -7,6 +7,9 @@ use MailPoet\Util\Security;
 if(!defined('ABSPATH')) exit;
 
 class CronHelper {
+  static $daemon_execution_limit = 30;
+  static $daemon_timeout_limit = 30;
+
   static function createDaemon($token) {
     $daemon = array(
       'status' => 'starting',
diff --git a/lib/Cron/Daemon.php b/lib/Cron/Daemon.php
index 2b83b96405..9bd9a8949d 100644
--- a/lib/Cron/Daemon.php
+++ b/lib/Cron/Daemon.php
@@ -11,7 +11,6 @@ class Daemon {
   public $daemon;
   public $request_payload;
   public $refreshed_token;
-  private $execution_time_limit = 30;
   private $timer;
 
   function __construct($request_payload = array()) {
@@ -40,12 +39,12 @@ class Daemon {
     } catch(Exception $e) {
     }
     $elapsed_time = microtime(true) - $this->timer;
-    if($elapsed_time < $this->execution_time_limit) {
-      sleep($this->execution_time_limit - $elapsed_time);
+    if($elapsed_time < CronHelper::$daemon_execution_limit) {
+      sleep(CronHelper::$daemon_execution_limit - $elapsed_time);
     }
-    // after each execution, re-read daemon data in case its status has changed
+    // after each execution, re-read daemon data in case it was deleted or
+    // its status has changed
     $daemon = CronHelper::getDaemon();
-    // if the token has changed, abort further processing
     if(!$daemon || $daemon['token'] !== $this->request_payload['token']) {
       exit;
     }
diff --git a/lib/Cron/Supervisor.php b/lib/Cron/Supervisor.php
index 9bda7ac52e..3e9bd9371b 100644
--- a/lib/Cron/Supervisor.php
+++ b/lib/Cron/Supervisor.php
@@ -7,7 +7,6 @@ class Supervisor {
   public $daemon;
   public $token;
   public $force_run;
-  private $timeout_limit = 40;
 
   function __construct($force_run = false) {
     $this->daemon = CronHelper::getDaemon();
@@ -32,13 +31,13 @@ class Supervisor {
     $elapsed_time = time() - (int) $daemon['updated_at'];
     // if it's been less than 40 seconds since last execution and we're not
     // force-running the daemon, return its status and do nothing
-    if($elapsed_time < $this->timeout_limit && !$this->force_run) {
+    if($elapsed_time < CronHelper::$daemon_timeout_limit && !$this->force_run) {
       return $this->formatDaemonStatusMessage($daemon['status']);
     }
     // if it's been less than 40 seconds since last execution, we are
     // force-running the daemon and it's either being started or stopped,
     // return its status and do nothing
-    elseif($elapsed_time < $this->timeout_limit &&
+    elseif($elapsed_time < CronHelper::$daemon_timeout_limit &&
       $this->force_run &&
       in_array($daemon['status'], array(
         'stopping',
diff --git a/lib/Cron/Workers/SendingQueue.php b/lib/Cron/Workers/SendingQueue.php
index 1424c71b13..9d13b5c753 100644
--- a/lib/Cron/Workers/SendingQueue.php
+++ b/lib/Cron/Workers/SendingQueue.php
@@ -1,6 +1,7 @@
 <?php
 namespace MailPoet\Cron\Workers;
 
+use MailPoet\Cron\CronHelper;
 use MailPoet\Mailer\Mailer;
 use MailPoet\Models\Newsletter;
 use MailPoet\Models\NewsletterStatistics;
@@ -11,7 +12,7 @@ use MailPoet\Newsletter\Shortcodes\Shortcodes;
 if(!defined('ABSPATH')) exit;
 
 class SendingQueue {
-  public $timer;
+  private $timer;
 
   function __construct($timer = false) {
     $this->timer = ($timer) ? $timer : microtime(true);
@@ -120,7 +121,7 @@ class SendingQueue {
 
   function checkExecutionTimer() {
     $elapsed_time = microtime(true) - $this->timer;
-    if($elapsed_time >= 30) throw new \Exception('Maximum execution time reached.');
+    if($elapsed_time >= CronHelper::$daemon_execution_limit) throw new \Exception(__('Maximum execution time reached.'));
   }
 
   function getQueues() {