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When I had long distance flights to Brazil, Argentina or Vladivostok I could sleep nearly 8 hours and it was ok. But for my wife or kids it can be problem.
Honestly I should say that sometimes when it is enough time I read books or talk with neighbors. Again if neighbors not against to talk and I'm not annoying them.
Anyway I hope once again I'll be able to visit again mentioned above South American countries, maybe Japan or like you travel to Australia with my family.