It sounds like your vent pipe may be blocked with lint. One way to test this is to disconnect the vent hose and let the dryer vent directly into your laundry room for one load. If the clothes dry fast, you know the problem is in the vent pipe. Most vent pipes have a screen near to where they vent to the outside. The purpose of the screen is to prevent small animals from entering. This is usually where the lint clog occurs. Many vent pipes have a way to take out this screen and clean it. I hope this advice helps you out.
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It sounds like your vent pipe may be blocked with lint. One way to test this is to disconnect the vent hose and let the dryer vent directly into your laundry room for one load. If the clothes dry fast, you know the problem is in the vent pipe. Most vent pipes have a screen near to where they vent to the outside. The purpose of the screen is to prevent small animals from entering. This is usually where the lint clog occurs. Many vent pipes have a way to take out this screen and clean it. I hope this advice helps you out.