Islamabad is 4 hours ahead of Madrid
Best overlap: 8:00 AM to 2:00 PM in Madrid is 12:00 PM to 6:00 PM in Islamabad.
If you set up a recurring sync, 8:00 AM to 2:00 PM in Madrid (12:00 PM to 6:00 PM in Islamabad) is the natural home for it. Despite the 4-hour difference, a 6-hour overlap keeps things simple and gives both teams breathing room. Finally, Madrid observes daylight saving and Islamabad doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.