Clothes took way too long to dry (1-3 hours)

The first thing I did was google "whirlpool dryer repair drying takes too long" to determine all of the possible parts I needed to order (the result was 3 possible parts, a heating element and two different thermostats). I then went to www.partselect.com (I'm a repeat customer) and searched the parts using the dryer model number listed just inside the door. I then printed the dryer model diagram off of the www.partselect.com website to determine the location of all the parts and how to replace them. Our first purchase was the new heating element from the www.partselect.com website, received it in just a couple of days and replaced it, but that did not fix the problem. We then ordered the two thermostats, again received them in 2-3 days, replaced them, and were drying clothes in <30 min. in no time! All we had to do was unplug the dryer, disconnect the vent hose, take the back off, unscrew each thermostat, disconnect the wires, install the new thermostats, reconnect the wires, screw the thermostats back in place, replace the back cover, reconnect the vent hose and plug the dryer back in. It took <15 min. for the complete repair! Thanks, www.partselect.com! I will continue to be a repeat customer!!!!!