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I do 24 hours 1-3x a week but with a twist. Most people think "24 hours" and think "in the same day." I will eat breakfast and lunch one day and then nothing until dinner time the following evening. It still accomplishes the 24 hours (more like 27-29).

I also generally exercise at the start of the fast to burn off my glycogen stores so my body relies on stored fat for energy the next day.

I do it differently, I eat dinner then don't eat again until the following dinner. I find that not eating breakfast helps keep hunger at bay.

Another popular option is the 8-hour eating window / 16 hour fast.

And intermittent fasting does seem a nice way to retain muscle mass: http://www.leangains.com/2011/03/intermittent-fasting-for-we...

is this a weight loss thing .. or just for focus?

It is more of a healthy living type of thing, doing it properly doesn't result in health loss. Here's a good overview of the health benefits of IF: http://www.marksdailyapple.com/health-benefits-of-intermitte...

For me, when I'm on a 24 hour fast- I feel more focused, more "alive" and not hungry at all (just make sure to drink plenty of water).