Shenzhen is 13 hours ahead of Ottawa
There is no standard 8-to-6 overlap. Someone joins early or late.
A 13-hour difference puts Ottawa and Shenzhen out of sync — when one team is mid-morning, the other is fast asleep. Consider rotating the inconvenience: one week Ottawa takes the early call, the next week Shenzhen does. Remember that Ottawa shifts for daylight saving and Shenzhen doesn't, so recalculate the overlap after each clock change.