Melbourne is 6 hours ahead of Islamabad
Best overlap: 8:00 AM to 12:00 PM in Islamabad is 2:00 PM to 6:00 PM in Melbourne.
Schedule calls for 8:00 AM to 12:00 PM in Islamabad — your colleagues in Melbourne will be online from 2:00 PM to 6:00 PM. Melbourne is 6 hours ahead of Islamabad, which gives you a solid 4-hour window. Book earlier in it and neither side is rushing. These times hold for most of the year, but Melbourne's daylight saving (which Islamabad doesn't use) shifts them by an hour twice annually.