I even tried running the dryer with the exhaust vent disconnected and just blowing into the room and still taking hours to dry. The air flow coming out seems pretty strong.
This can be a *very* difficult fault to diagnose.
On some Samsung dryers that I've serviced---if the symptom was:
"Poor Heating/Long Time To Dry"
"Igniter Glows-but-No Flame"
(The exhaust vent system is checked & okay and the gas valve coils were verified to be good)
Test Thermistor ohms at room temperature (listed as 77F) Located on blower housing.
I check the voltage from the Main Board-to-the-Gas-Valve-Coils (115 volts)
Test the Flame Sensor Switch (ohm & voltage)
Test the motor Centrifugal Switch (ohm & voltage)
In most cases--the relay on the Main Board was either erratic or failed to send voltage to the gas valve coils.
This dryer is a bit technical for the average DIYer. It may be wise to contact an authorized Samsung Service Center in your area for an out-of-warranty repair. A zip code service locator is available on Samsung's website (click "Support" first):www.samsungusa.com