It often does seem thick enough after just a few minutes but if you don't beat it long enough it will not hold it's shape. There was a gal in my course 2 class that had done this, she would make the most beautiful flowers that would then sink into themselves after a few minutes. Definitely go the whole 10 minutes.
If you have a hand mixer you need to beat for 10 min. If you have a stand mixer 7-9 min is fine. You can tell if you under mix because the icing will not hold a stiff peak. Over beating results in too many air bubbles and when dry the flowers will break.
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