I wouldn't worry about it; I don't think that the sugar would be completely fermented in a little over 60 minutes. I would be a little concerned about the sugar settling to the bottom though. I recommend CAREFULLY using a sanitized mash paddle or spoon and stir the beer just to ensure it hasn't all settled. Be very careful to ensure that you do not create any bubbles or oxidize the beer.
15 Gallons of New England Hard Cider - Four yeasts: Ale yeast, two cider yeasts, and a champagne yeast.
Helliday Ale and Chocolate Nitro Stout