Jakarta is 7 hours ahead of Reykjavik
Best overlap: 8:00 AM to 11:00 AM in Reykjavik is 3:00 PM to 6:00 PM in Jakarta.
The best time to meet is 8:00 AM to 11:00 AM in Reykjavik, which is 3:00 PM to 6:00 PM in Jakarta. The shared window is roughly 3 hours; treat its midpoint as the default and you'll keep both teams happy.