Since FAR117 rules are based upon Flight Duty Periods, LogTen Pro uses the FDP Start and FDP End fields within the Duty tab. If you do not yet have FDP periods defined, the feature will prompt you to "enter an FDP Start time". Note that the FDP fields are separate from the regular On Duty / Off Duty fields. Please see our Logging Duty & Rest article for more details on how to log FDP.
LogTen uses the FAA Augmented and Unaugmented Limit tables (seen below) and the FDP Start time (adjusted to your acclimated timezone and segments) to determine Max Duty.
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