It depends on where you are leaving from and going to. I pretty much lived in the air for a while which is why I prefer long flights. The hassel to board a 1 hour flight is the same as a long flight. If I go through all that I prefer to go somewhere far away!
If I was headed to Malysia, India, Thailand, Indonesia, Singapore from US, the get on and off fits into my "maybe do that 2 times". Except going to Mumbai, you can fly direct, around 16 -17 hours, and US to China always direct 14hrs roughly. Layovers in either england, germany, netherlands or france.
When I lived in China, it was a direct flight, ~5 hours to singapore, malysia, indonesia, Thai etc., maybe 9 hours to India.
Airlines - United, Lufthansa, Singapore Air, China Eastern, Air France, Mumbai Air, Malysia air, and a few smaller regional airlines in asia.