I think it would be pointless. In my experience, the first day is nothing more than the body adjusting to the liquid diet. Sometimes I get a caffeine withdrawal headache, but even that usually doesn't kick in until day two. Deep tissue cleansing doesn't even start until day 10 or thereabouts, so 10 days is the minimum.
I've done the Master-Cleanse multiple times, so many I've lost count, but at least a dozen over the last five years, ranging from 10 days to 21 days. My skin has never looked better and I feel great.