Lint can be a real problem with dryers because it restricts the air flow inside the dryer drum during the drying cycle.  Air flow in the drum during the drying cycle is very important because the moisture from the wet clothes needs to be flushed out.  The air flow also needs to cool the heater element to prevent overheating and damage. The clothes will take longer to dry and also can cause damage to thermostats, heaters, and electronics. This picture shows lint buildup around the heater element and the thermostats.  This lint buildup suggests there may be a vent restriction.  Air back-pressure causes this lint to flow inwards and into the interior of the dryer. Dryer vents should be professionally cleaned at regular intervals to maintain proper dryer operation and to avoid costly repairs.  Western Appliance can recommend a good company to have this service performed.  For any questions feel free to call Rich at 208-344-4893 or visit our website at https://appliancerepairboise.com Thank you Rich