That's enough for a free round trip to Japan (or, from Japan, to here). It's almost enough for two round trip tickets to Hawaii, but (for obvious reasons), that's no longer my main measuring stick for those miles. If I get to keep them, it will be rather significant, for (if I get into JET) it will make a free trip back from Japan quite possible while I'm there, or alternately, it will make a trip to Japan (for an interview or who knows what) quite possible (if I don't get into JET).
It's not, however, enough miles to go to Europe from Japan, so if I end up in Japan, the chances of me making the Glasgow WorldCon are rather slim. But I suppose that was already rather obvious.