Here are our rock candies growing on day 2, the left & on day 3, the right. This experiment was quite a challenge for us, and quite the experiment! We first started with taller fluted glasses letting them grow for 4 days. The width of the sugar sealed them to the fluted bottoms making them permanently attached to the bottom. On our second attempt we used the same fluted glasses but only let the candy grow for 2 days, thinking this would be the trick. It wasn't - for 2 days or 4 days there wasn't much growth difference & it still sealed the bottom permanently to the base of the candy stick. The above process became our third & final attempt using a non-fluted glass for only 2 days of growth, which turned out perfectly.