Best overlap: 8:00 AM to 11:00 AM in Manchester is 3:00 PM to 6:00 PM in Jakarta.
Both offices are open during 8:00 AM to 11:00 AM Manchester time, which is 3:00 PM to 6:00 PM in Jakarta. You've got a decent 3-hour window. Set a recurring time near 8:00 AM in Manchester (3:00 PM in Jakarta) and stick to it. Just remember Manchester changes its clocks for daylight saving and Jakarta doesn't, so confirm the overlap whenever the seasons turn.
London to New York is five hours apart, except for the five weeks a year when it isn't. Exact overlap windows for every US zone, the 2026 DST mismatch dates, and where to put the recurring sync. -