2.5 - 3.5 hours on most v8s. The larger the engine the more time. 1.5 - 2.0 hours on 4 and smaller 6 litre engines. Ie. A 3.3 litre on a Dodge minivan needs approximately 2.5-3 hours. This is approximate, plugging your car overnight is the way to go. If your after saving some energy then 4 hours will cut for most cars.
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