Montreal is 5 hours behind Lagos
Best overlap: 1:00 PM to 6:00 PM in Lagos is 8:00 AM to 1:00 PM in Montreal.
Your window to reach both cities is 1:00 PM to 6:00 PM in Lagos, which converts to 8:00 AM to 1:00 PM in Montreal. With about 5 hours of overlap, there's comfortable room for a daily stand-up — 1:00 PM in Lagos / 8:00 AM in Montreal works well. Note the seasonal wrinkle: when Montreal is on daylight saving and Lagos isn't, the gap between them grows or shrinks by an hour.