I fed mine three times a day until he was about 15 weeks, and then switched to twice a day. I don't think I'll ever switch to once a day - mostly because I want his blood sugar to be balanced.
Plus, he's very food motivated with behavior and training. If he's not at least a little hungry, I won't be able to train him to do ****. If I gave him an entire day's food all at once, he won't cooperate with anything at all lol.
That said, I do underfeed him (below the label's recommendation) but he gets tons of healthy treats (usually freeze dried raw meat) though out the day. Sometimes I put all his food in kongs (I mix dry Acana kibble with maybe a boiled veggie mash, for example, or a spoon full of wet food) and let him work at it over a few hours.