Some pilots will announce wheels-up-to-wheels-down time, some will say total block time, some both - hard to say what he meant.

But the real question is - why is the flight time important? You're alluding to some issue with, presumably, a flight being delayed or canceled after boarding or something like that? If you explain the details and context, we may be able to offer some other inputs or advice.

Any guesses about what the flight time could have or should have been, would be imprecise speculation at best - too many variables that no one outside the airline could confirm.