Perhaps you’ve noticed that flights flown on different airlines between the same airports take different amounts of time. You might reasonably ask: why would different flights, departing from and arriving to the same airport take different amounts of time? The total amount of time a flight takes — from pushing back from the departure gate (“off-blocks”), to arriving at the destination gate (“on-blocks”) — is called “block time”, and airline block times vary for the same routes.

For example, if you are traveling from San Francisco (SFO) to Los Angeles (LAX) you may see a number of non-stop flight options with varying durations or “block times”. Block time includes the time to taxi-out to the runway, the actual flight duration and the time to taxi to the arrival gate, but the published schedule for the flight doesn’t break these elements apart.

https://www.flightstats.com/company/what-is-block-time-in-an...

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Note added at 6 hrs (2018-08-17 12:00:05 GMT)
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"Zablokowany czas latania" oznacza czas pomiędzy pierwszym wyjazdem z miejsca postoju samolotu w celu wykonania startu, do momentu zakończenia pracy na wyznaczonej pozycji postojowej i wyłączenia wszystkich silników.
http://context.reverso.net/tłumaczenie/angielski-polski/park...

Patrz AIP, str. 161.
http://www.smartaviation.eu/EP_GEN_4_1_en.pdf