Look at the photo on the left of a badly installed dryer vent.
Incorrect dryer vent installations can lead to big future problems.
For example here this line is venting inside the Home's crawl space and this means lint all over.
Lint is dust mite food. Fine lint particles may find their way through small cracks and into the living space of the Home. Breathing fine lint particles will cause pulmonary disease. When I fix these wrongly installed lines or damage ones I some times cough and get tightness in breathing if I forget to wear my mask.
Some other related problems is the water you see on the floor under the dryer line that comes from lack of venting. That is the steam condensation build up or moisture that gives a mildew odor or even worst like sewage aroma in the home or dryer machine itself then on your clothes.
The situation is always different or worst like a fire in the Home. When you first notice delays in drying that is your flag to get the dryer and dryer vent line inspected and serviced by a professional.