Sorry, Jovin - I certainly didn't mean to sound mean.
But, I didn't really say what I ment to say in the manner that I intended to say it, either.
What I ment to say was ... don't sweat it - the refridgerator will do just fine. All you're trying to do is cool the butter down so that it gets solid again. If you want to pop it in the freezer, that would also work ... but you'll probably only need about 20-minutes to accomplish the same thing as 30-45 minutes in the 'fridge.