Adelaide is 6.5 hours ahead of Nairobi
Best overlap: 8:00 AM to 12:00 PM in Nairobi is 2:30 PM to 6:30 PM in Adelaide.
Keep meetings inside 8:00 AM to 12:00 PM in Nairobi — that maps to 2:30 PM to 6:30 PM in Adelaide. Adelaide is 6.5 hours ahead of Nairobi, 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 Adelaide's daylight saving (which Nairobi doesn't use) shifts them by an hour twice annually.