Kathmandu is 10.75 hours ahead of Montreal
There is no standard 8-to-6 overlap. Someone joins early or late.
The 10.75-hour offset between Montreal and Kathmandu means there's no point hunting for a 9-to-5 overlap — there isn't one. Expect compromise: someone in Montreal or Kathmandu will need to take the call outside the usual 9-to-5, so share that load. Keep an eye on the calendar — Montreal observes daylight saving and Kathmandu doesn't, which nudges this window by an hour twice a year.