Some folks believe that a full load in the washer or dryer consists of however much laundry can be crammed in while still being able to close the lid. Though you may not be stuffing two weeks' worth of laundry into one load, a dryer full of heavy, hard-to-dry items such as blue jeans, jackets and towels, will take a long time to dry. Try cutting down the size of your load.
Tough it may seem obvious, remember to check and clean your lint filter before each load. If you have to dry a load a second time, first re-clean the filter.
Just because the dryer hose is clear of clogs and lint does not mean the duct work inside of the dryer itself isn't clogged. Pull out your lint filter and look down into the dryer. If you see giant clumps of lint, there is a good chance the internal ducts are clogged. Try to vacuum out the lint.
A broken or failing heating element will cause your appliance to dry very slowly. You will need to replace the heating element or the entire appliance. The thermostat that controls your dryer's heat level can also malfunction. Contact a repair professional.