So how much video will fit on a DVD?

The amount of video that you can distribute on your DVD depends on a number of factors including the bit-rate of the encoded video, the associated audio tracks (multiple-language) and additional material along with menu complexity, but a general rule of thumb is about 130 minutes (2 hours 10 minutes) for DVD-5 with standard bit-rate and a 48 kHz audio stream. DVD-9 will hold about 4 hours of video.