New istanbul Airport to Sabiha Gokcen Airport Taxi Duration and Price

Istanbul's traffic is unpredictable. If you do not face with any traffic, it will take at least 30-40 minutes from Istanbul Airport to Sabina Gokcen Airport by taxi. But your date is a work day, so you may face with traffic. So it will take up to 2hours when heavy traffic occurs. So it would be better for you to think worst and plan for 2hours. Cost of taxi from Istanbul Airport to Sabina Gokcen Airport will be at least 200TL, and will be go up to 300TL if you face with heavy traffic. You can check estimated taxi fares within Istanbul by the link below.
https://isturkeysafe.com/ISL-istanbul-airport-by-taxi