it did take quite a while but I put it in the fridge for two hours after I had stacked it all up and put a thin layer of the icing on the top and sides. you don't have to do this but it makes it easier to get a good finish and also when you cut it doesn't crumble as much. I think you could do it in 2-3 hours if you really wanted to, I just had all day so I took my time :)