Product review (2 stars): Defrosts for about an hour!!!
I have tried three of these now, and the defrost cycle lasts anywhere from 54 minutes to a full hour! I understand its an accumulative timer (it only runs when the compressor is running), so its normal for it to run more than 16 hours between defrost cycles. But I certainly don't understand why it runs the defrost cycle for so long! In the heat of the summer, the fridge starts to get pretty warm after an hour!! The first one I bought off ebay, so I figured it must be a cheap knockoff. The next two I got from a reputable appliance store (one purchased, and one replacement when they agreed that that wasn't right), and same thing!! I guess its time to try an aftermarket adjustable timer!

Update: Today the appliance store told me the only other thing it could be that could cause a defrost timer to run long defrost cycles is the cold control. Mine seems to function perfectly, and has none of the normal symptoms of being bad. That said, its no longer available so I will never know. I spent many hours researching this, and I have not found one other person that had this problem. Anyone hear of this?! I guess the least I could do is add another star!