Montreal is 6 hours ahead of Honolulu
Best overlap: 8:00 AM to 12:00 PM in Honolulu is 2:00 PM to 6:00 PM in Montreal.
The overlap falls at 8:00 AM to 12:00 PM in Honolulu, or 2:00 PM to 6:00 PM if you're in Montreal. You get roughly 4 hours of shared time, so aim for the middle of that window to keep the call comfortable for both teams. The window above shifts seasonally: Montreal keeps daylight saving while Honolulu ignores it.