Good afternoon! That long drying time is a classic sign of a blocked exhaust vent line, and it can actually be a major fire hazard for your home if you ignore it. I had the exact same issue where my dryer was spinning for hours and my clothes were still damp and steaming. I decided not to take any safety risks and called Major Appliance Repair https://majorappliancerepair.info/ to inspect the entire setup. They arrived super quickly for a fast in-home appliance repair and found a massive clog of compacted lint deep inside the wall vent pipe. They cleared it out completely and checked the internal thermal fuses too. Now my towels dry in thirty minutes flat! You should definitely give them a call to protect your house and save electricity.