If you're experiencing a dryer that requires a longer time to dry, you may want to view this link:
Pay particular attention to the first major paragraph. I know the link is for a no heat problem, however, if you have a dryer that is starved for air, the heating circuits will eventually fail. In most cases, a no heat, or longer dry time problem is directly associated to clogged ventilation, kinked dryer vent hoses, improperly installed vent ducting, a clogged blower fan assembly, or rodents. Yes...the last one isn't always fun, but I have found bird nests, mice nests and even snakes inside dryer vents, clogging the air flow. The symptims were all the same - a dryer that would not dry properly. Before you assume you have a component going bad, take a good look at the way your dyrer is installed and inspect it thoroughly for what might be a good cleaning. The outsiode dryer vent should be at least 12 inches off the ground and a louver is recommended to cover the end to prevent critters from getting inside. In addtion, the SHORTER nd STRAIGHTER the dryer exhaust vent is, the better. If you have an exhaust vent with excessive bends, or excessive run length, this can contribute to poor heating of the dryer. Especially exhaust vents that run thorugh an attic or under a crawl space. They typcially develop sags, which create choke points where lint can accumulate to the point where it clogs. I do not know what your situation may be, but provide this as some helpful guidance just in case. I hope you find this information helpful. If you inspect your dyer and still have problems, please post back and let me know.