It's easy to use Aviapages Flight Calculator in Leon.
https://aviapages.com/leon/connect/
Access "Request/Quote" tool in "Sales" module.
Click on the flight you need to estimate the flight time for.
Under the flight data click button "Calculate Flight Time".
In the opened window switch to "Aviapages".
After the calculation was processed, press "Apply" to use this flight time for your quote.
