Dryer taking to long to dry clothes

Dryer Repair
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1

Brand: Whirlpool
Model Number: WGD4800BQ0
Main Symptom: Taking to long to dry clothes
What happens & when:

Error Code (if any):
Parts or tests already tried: replaced Cycling Thermostat, Dryer Gas Valve Ignition Solenoid Coil, Dryer Thermal Cut-Off Fuse Kit
Photos / video link:

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Check to make sure that the venting is clear as this would be the first step in any dryer that is taking too long to dry clothes.