Ottawa is 13 hours behind Shenzhen
There is no standard 8-to-6 overlap. Someone joins early or late.
Set against a 13-hour difference, Shenzhen and Ottawa run their workdays on completely separate schedules. Block a single recurring off-hours slot that both teams agree on, rather than negotiating a new awkward time every week. Seasonal note: Ottawa uses daylight saving and Shenzhen doesn't, so double-check the times in your own months — they can move by an hour.