When pilots are free during a 14 hour flight, they typically use the time to rest and relax.
This is especially important for long-haul flights as it helps them stay alert and focused throughout the journey.
Pilots may also take advantage of this downtime to catch up on paperwork or review their flight plans for the upcoming legs of the trip.
Additionally, some pilots like to read books or watch movies in order to pass the time more quickly while still staying engaged with their surroundings.
Finally, many pilots enjoy engaging in friendly conversations with passengers who are interested in learning more about aviation!
Source: Quora