Slow drying times are caused by either a failure of the cycling thermostat or the fact that the venting system is obstructed or that the blower is not working correctly.

You will need to open up the dryer and check to make sure the blower wheel/fan is ok. Then clean out the venting system inside the dryer, including the air intake, and also clean out the pipe from the dryer to the outside.

Try it again, this will likely solve your problem.