I do the PhosphoSoda prep. No way in h*ll I would ever do ANY of the Lytely preps again! I just can NOT do that much volume of liquid in that short amount of time to say nothing of the fact that it is such foul tasting sewer water!!!
Don't misunderstand: you still have to do that volume of clear liquid w/PhosphoSoda (at least you SHOULD to protect your kidneys, etc.) BUT you can spread the volume out over a longer period of time. Not that PhosphoSoda is such great tasting stuff (under statement!)
As for timing: I didn't put that early morning scope PhosphoSoda instructions back in my file last time I had it out. *sigh*. I REALLY needed and wanted it for my last scope which was the FIRST early afternoon scope I've done.
What I would do is figuring the hours of the prep instruction for the first thing in the moring scope and then reconfigure that time frame to fit the scheduled time of your upcoming scope.
Try a google search. There's a variety of ways to prep w/PhosphoSoda and Magnesium Citrate, etc. Pick the one that sounds most convenient w/your schedule for the CC scope.
Some people are like Slinkies... Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs.