In
6 months
It all depends on what your sailing on. 1800's sailing ship
China doesn't need to sail to Southeast Asia. It's already there.
Southwest
southwest
i do not have a clue
East to west direction... ;) _21
china
China
You will sail north.
That's going to depend on the windspeed, the direction of the wind compared to the direction of the km you want to sail, the design of the boat, and your skill.
westsouthwest