I didn't feed my lab according to a schedule at all. With studying dog behaviour, I found that my lab really needed food as her incentive. She got 6 kongs a day when she went into her crate or when she was locked into her laundry or small space. We used food to deter destructive natures....

So all in all.... it doesn't really matter. I think that as long as they get 3 meals a day until they are 12-14 weeks than you are all good.