ANSWERS: 1
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Hard to say without knowing a little more. I mean, take a look at this - http://www.houseofbatteries.com/pdf/MN1300 - and you will notice that the discharge curves are non-linear and vary based on temperature and amp-draw. Duracell D-cells are nominally rated at 20.5 amp-hours so you can bet that any adapter you get will be quite large if the toy is running those D-cells dead in less than a full day. However, the fact that you mention that it doesn't last that long even with little use leads me to wonder how much the thing drains when not in use. Tell me how long "not very long" is and I might be able to help you more.
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