The maximum flight distance of Tello is around 100 meters (328 feet). This is due to the maximum signal transmission range of the Wi-Fi connection.
It's important to note that while the signal transmission range is maximum 100 meters (328 feet), wind, signal interference, and other factors can reduce the maximum usable distance.
Also, in different countries, the maximum altitude of flight may vary due to aviation laws. In the US, the maximum altitude is 400 feet (122 meters). Depending on your country, the maximum altitude for drone flight might be less than 400 feet (122 meters).
Finally, DJI provides a "no fly zone" feature that prevents unauthorized flight in certain areas like international airports, national parks, and other sensitive areas. The app will alert you if you go into a "no-fly zone" and will not allow the drone to fly beyond the zone.
For more information, you can check this link: https://www.ryzerobotics.com/tello/faq/ceiling