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FTL Calculator is a tool that helps you planning Crew duties with accordance to Operators Flight Times and Duty Limitations.
As you can see in the screenshot, it takes the following values into consideration:
Basic duty is calculated for both Single Crew (if applicable) and Multi Crew. This includes reporting and post-flight duty times.
Latest time on blocks is the latest time allowed for Block On. This is Basic duty reduced by the check out time.