I just finished pitching another starter using Fermentis dry yeast. This time I used T-58, a spicy Belgian ale yeast. Only 45 minutes after pitching, the starter is active. I am prone to believe that it is just re-hydrating rather than “going to town.” But I don’t know how yeast think.
Here are two pics I snapped. The first is the mini-wort about to boil with a yeast nutrient stain on top. It looks drinkable itself. The second is the active starter.
 
That is a beautiful starter. And it does look drinkable. I urge you to sample it. Never be afraid to taste any part of your own ingredients, otherwise you probably shouldn’t be brewing with it.