[javamannen2]

I'm sorry, but you haven't understood the concept.
The only real requisite for this to work is that the desired average weight loss rate over the whole period of the "diet" is less than or equal to the average longterm weight loss rate of water fasting. If the rates are close to equal (not recommended), then you have a full on water fast. If the desired rate is less than the fasting rate, you'll get some eating days and some fasting days. In the long run it will be a linear weight loss. It's really that simple. You don't have to complicate things with calorie calculations. B.T.W I'm not claiming that it's healthy. You may lose muscle instead of fat. But you'll lose the weight in the alotted timeframe (if it's realistically set to begin with). I've lost 27 kg using variations of this method.

Edit: Of course you can't lose 60 kg in 30 days, because even the sustained weight loss rate of water fasting wouldn't be fast (no pun intended) enough. Unless you exercise too...