How many minutes of video does a dual layer DVD hold?

Dual layer DVD+Rs and DVD-Rs both have 8.5GB of storage capacity and can hold approximately 16 hours of VHS quality video. There is a slight difference between these formats in capacity when recording DVD quality video, however. A DVD-R DL will hold approximately 3.5 hours of DVD quality video and the DVD+R DL will hold 4 hours.

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