Montreal is 13 hours behind Osaka

There is no standard 8-to-6 overlap. Someone joins early or late.

Osaka and Montreal live on different parts of the day. With 13 hours between them, standard working hours simply don't meet. Make the most of handoffs — end-of-day in one city becomes start-of-day in the other, so pass work along rather than meeting live. Seasonal note: Montreal uses daylight saving and Osaka doesn't, so double-check the times in your own months — they can move by an hour.