On two different airlines, I was watching the free TV on my iPad on a long flight, and a window appeared saying, "You have used up your 25 minutes". The airline said they never heard that complaint before, so I think it might be my filtering software. The two airlines had very different TV systems and different web addresses. Oddly enough, on the first airline, the TV continued playing but with that irritating window in the way; on the second airline, the TV show stopped completely. It was a documentary about birds of paradise.