I work for a Japanese company here in america, called Fujitsu. We make self check out machines, not quite a dream job and definitely not a 3d job. We at one time had 3 Japanese guys come to visit our factory and do some work here for about 3 months. Within the first 2 weeks me a couple friends and the japanese guys would go out for drinks after work or on weekends and hang out. They learned english VERY QUICK. Bridge words needed to be cut out of sentences though at first. Then by the time they left I think they spoke better english than most american's I've met. Cool guys... they loved to drink and hike so they had a lot of fun with me and my friends (who also work with me). Man I miss those guys.

Not sure this helps but I wanted to share that just in case.