I performed some extra tests with my USB fridge (see Quickpost: Testing A USB Fridge).
Here is how the temperature evolved when I put a can with cold water (around 12° C) in the USB fridge:
The temperature increased around 2° C over a period of 12 hours (room temperature was around 17 °C).
That required around 57 Wh.
And the temperature at the top of the can increased more than at the bottom:
For reference, here is how the temperature evolves of a cooled can of water left on the desk in that same room (so not inside the USB fridge):
Quickpost info
Didier Stevens 
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