I set some eggs the same time Gma C did. I took mine from the incubator after about 12 hours of hatching. Put them in the brooder under a heat lamp to help finish drying. (Brooder was 95 degrees) But I want to say all mine started eating and drinking between 24-36 hours after hatching.
I set mine on the 9th at 8pm. I am 1 hour behind you. I set 36 eggs. Right now I have one completely hatched and 35 still just sitting there. Tomorrow night should be our 21 days. We should expect to see most hatched by the 31st