I feed mine twice a day.

I used to feed them once in the evening but Jess started suffering with the acidic stomach problem in the afternoon and knowing it was because she was too hungry, I decided to split their daily intake into two meals. I had to do the same with Mist because I couldn't feed Jess without feeding Mist especially as I was trying to establish a clear cut pecking order between them at the time and had to feed Mist first before Jess.

Personally, I would never go back to feeding once a day. If the dog eats it's whole daily intake in one go, it overloads it's system and wouldn't be able to absorb all the goodness from it anyway as there would be too much so some of it would come out of the other end wasted and the dog spends half the day feeling hungry.
I find that the dogs do so much better when given two smaller meals or three even smaller ones for those who like to feed their dogs that way. Can help combat weight problems too because feeding little and often helps to speed up their metabolism and stop it becoming sluggish.

I know in the wild, they have to gorge themselves and then go for days without food maybe but thats because they have no other choice. Wild wolves generally don't live beyond about 7-8 years because their lives are so hard.