I have to make a tangled tower for one of my goddaughter, for next sunday. I'm going to prepare some things ahead since I work till 9PM almost everyday. I planning on using RKT for the first time. But I was wondering how long in advance I could make the recipe or if I had to make it on the day I plan to use it? Does it become at one point too hard/stiff to work with and so you prepare it lats minute?
I've also seen recipe that call for butter in it and others that don't, which is the best?
thank you for your answers.

when I make RKTs for my cakes, I only use marshmallows and cereal, no butter. I have made them a couple of days in advance before - no problem. If they set up too hard, just nuke them for a couple of seconds and they will soften up again.

Thank you very much Dani1081 for your answer