A month would be more realistic, but i'm not sure you can replicate the real situation in a time-box. A single week, like any change in diet, would just show ho

A month would be more realistic, but i'm not sure you can replicate the real situation in a time-box. A single week, like any change in diet, would just show how difficult it is to change habits, and how well you can forestall your desires. A month would allow time to form new habits, but you can still wait out the time limit to indulge your cravings.