As long as you cut the growth shoot and put in water immediately to avoid an embolism you can actually keep them in the water for quite some time. I've successfully rooted clones from cuts that sat in water in my fridge for a week.

Sounds like you have the concept down pretty well so it should stand a good chance of working out well for you. I swear by Olivia's cloning solution and would recommend it cuz its never failed me. It will make your chance of success much higher IMO.