Hi sl!

In terms of CKD, 48 hours is generally considered useful enough to reset leptin with minimal fat spill-over. That is, provided that you don't eat too much fat. Beyond that length of time, your body will start to switch back to storage of excess carbs and fat. If you like, you might want to do two carb-ups, with 4-5 days on Atkins in between, and see how that goes (besides, you can eat plenty of carbs in 48 hours!).

Good luck with whatever you choose to do--and keep us posted!