The problem isn't with the unit taking a long time to chill a bottle of wine, the problem is that it doesn't chill a bottle of wine.
I put a bottle of room temperature Chablis in, and selected Chablis from the list of white wines. The unit said it would chill it to 46 degrees, and indicated that the starting temp was 77. That was my first concern, because the bottle was room temperature, and room temp was 70. The unit took more than 30 minutes to get the bottle to the desired temp (according to the units thermostats), but when I opened the bottle, the wine was probably a bit warmer than a pinot should be served at. I turned the unit off, placed the bottle back in (using the accompanying sleeve both time, btw), and this time the starting temp read 61 degrees. In other words, it disagreed with itself...
Soo...I chilled it again, for another 20 minutes, and upon reaching 46 (again) the bottle was no cooler than it was before.
I don't understand how these are selling. They are probably good for bringing room temp reds down to the appropriate serving level, but this simply does not chill white, rose, or sparkling wines to the desired temperature. So it's great, I suppose, for someone who doesn't have a wine refrigerator, or a cellar, but who wants to drink red wines at the appropriate temperature. It's terrible for anything other than that.
This is as disappointed as I've ever been with a product before.