How early should you arrive for a long haul flight?

Related questions

1. Can I check in 8 hours before my flight?
2. Do I really need to be at the airport 3 hours early?
3. How many hours before your flight can you enter the airport?
4. Is it better to check in online or at the airport?
5. Can I stay in airport overnight?
6. Is there WiFi on Aeroflot?
7. How many hours before flight can I go through security?
8. How early should you be at the airport?
9. How early can I go through TSA?
10. How many hours before a flight can you check in online?

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20. #departures