I'm on day 5 of my first Master-Cleanse and I've been using the SWF (Salt-Water-Flush) in the morning. I'm usually okay alloting about an hour to it before I feel secure to go out to work and I do get up a little earlier to get it all finished. If I was starting this Saturday, I would try one on Sunday (and maybe Saturday too?) and see how long it takes for your particular system. Good luck!