Irish Whisky

[Skid20]

Need a little help here. I’m doing my first Whisky run after successfully completing 4 BW's. I mashed in before memorial weekend and set my fermenter in a temp controlled rm set to 78 degrees with a starting SG of 1.045. Did not get to see the yeast activity in the mash after pitching because I was out of town for 4-days. I checked it when I got home and there was hardly any activity on the surface of the mash and the SG was 1.004.

I boiled the corn using a automatic stirring machine I put together and did an iodine test which showed full conversion. My question(s) is, is it typical for corn mash's to have slow ferments? Should I add more nutrients? I should also add that this was a prepackaged 10 gal kit from spiritcraft and had all the nutrients and enzymes included.