I'm a little reticent to answer this since the last time I answered a question about how long I kept something, I was informed how wrong I was to do so. But, since I hate to see you go unanswered, here goes:I, personally, have frozen royal icing for over three months and used it after thawing with no problems. I don't know about leaving it on the counter more than a week as I haven't done that. Hopefully, someone who has will come along to help.
10/7/11 at 11:58am