The Wireless PTLevel is designed to be battery conscious and with that, it implements a special monitoring schedule. By default, it wakes up every 30 minutes to check the level. Then, if the level is out by approx. 10% since the last 30 minute check, it will update online. So you should see a fill or a major draw within 30 minutes. Finally, the device reports online every 24 hours no matter what. 

 

Now, the above mentioned schedule is fully adjustable online. However, you just need to keep in mind the battery usage and how often you want to change the batteries. You can find the settings by click on the "Features" button of the appropriate device from the dashboard. Then click on the "Power" tab as seen below.

To get the most accurate readings out of your PTLevel, read more here.