Santiago is 8 hours behind Islamabad
Best overlap: 4:00 PM to 6:00 PM in Islamabad is 8:00 AM to 10:00 AM in Santiago.
4:00 PM to 6:00 PM in Islamabad is when Santiago is also working, at 8:00 AM to 10:00 AM their time. Because Santiago is 8 hours behind Islamabad, the shared window is only about 2 hours. A fixed slot at 4:00 PM in Islamabad (8:00 AM in Santiago) saves a lot of back-and-forth. Watch the DST gap — when Santiago changes its clocks and Islamabad stays the same, this window slides by an hour.