Tel Aviv is 0.5 hours behind Tehran
Best overlap: 8:30 AM to 6:30 PM in Tehran is 8:00 AM to 6:00 PM in Tel Aviv.
Tehran and Tel Aviv overlap from 8:30 AM to 6:30 PM (Tehran) to the equivalent 8:00 AM to 6:00 PM in Tel Aviv — that's your meeting window. 10 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved. One seasonal catch: Tel Aviv springs forward and falls back, but Tehran doesn't, so the gap changes by an hour for several months of the year.