How far east can you go before you're heading west?
There's no crossover point, no East Pole where you begin to head west. If you're heading east you'll continue to head east. If you were going north or south you would begin heading in the opposite direction the moment you crossed the pole.
well if you stay going east you will always be going east ._.
Forever. East is a direction, like 'right' or 'left'. Unless you turn around, you'll still be heading east.