Left until it thumps against the stop, right until it thumps against the stop. However, I ONLY do this just before startup or when I'm FRAKKING BORED sitting at the longest traffic light in the world, and during transactions when I'm going to take my foot off the clutch (drive thrus, parking passes, etc.)
On an unrelated note, lever travel for reverse is like twice as long as for forward gears and has a stiff feeling pre-engagement a few mm short of being properly engaged - so every once in awhile I'll accidentally half-shift into reverse and lightly grind some gears before cussing and shit. It never fails that I do that in front of someone else who drives a manual who then looks at me like my head's fallen off. No guys, really, it's the shift mechanism. I promise.
