My internal clock is broken due to my traveling. I am is US for 6 days than back again in Okayama. Unfortunately, the way the meetings and locations are working out, I have several 1-2 week trips through the end of this year and throughout next year. It's not the healthiest approach but that is the way it is.
The relationship building in Japan takes time but I would rather spend all my time there as I find the people very upbeat and the work challenging. But...the global nature of our business doen't allow for it so I'm stuck doing the hit-and-runs.
Good luck to you in Tokyo. I spend some time there near Shinjuku during my weeks in Japan but, to be honest, like the somewhat slower pace of Okayama.