Just made my first batch. Thinkin' I did something wrong...I ended up using over 4 lbs of ps, and I still had some that had not been kneaded. Anyone else ever had a similar problem?

I'm using it for some accents on a cake for this weekend, but I also bought a dummy to try to cover for next week. How long will it stay good? Keep it on the counter?

I love this fondant recipe. It does take a lot of ps, it seems to be softer than others, especially the commercial stuff. I made a triple recipe and kneaded ps in until I could handle it easily though it needed to be a bit stiffer for working with. I then divided it into 2 lb. portions and froze all but what I needed at the time. That way I only have to work on one batch at a time as I need it. I take it out of the freezer and the night before I want to use it and I like working on it when it's a bit softer. Of course if I want to cover a cake or do fondant sculpture I need it firmer.
As for storing the unfrozen fondant, I always keep it in the fridge.