The Envoy at your site uploads microinverter data to Enlighten approximately every 15 minutes. It may take longer if a system is very large, has communication issues, or is set to low-bandwidth reporting mode. You can use the Envoy page to diagnose communication issues.
Enlighten always displays the most recent data received from your system. You can check the time of the last report from Envoy by looking at the latest power timestamp on the Energy tab of the system sidebar.