How long will it take me from the main train station to Frankfurt International Airport, Germany?

I'll take a plane from Frankfurt International Airport at 17:30. How can I get there except taxi? How long will it take me to get there from the main train station? When shall I start off from the station? I'll get to Frankfurt from Stuttgart by train. But I'm not sure whether I can get off at the main... show more I'll take a plane from Frankfurt International Airport at 17:30. How can I get there except taxi? How long will it take me to get there from the main train station? When shall I start off from the station? I'll get to Frankfurt from Stuttgart by train. But I'm not sure whether I can get off at the main station.
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