For pet ducks that you don't care about growing out quickly, you can feed them 3 or 4 times a day and they'll be fine. That's what I prefer, because I don't want them to grow super fast. My goal is longevity. I'm really careful about not letting any of my animals get fat, though. I think you'll be fine either way. Do whatever works best for you. As long as they are growing and not getting too fat, they'll be OK.
If you do it this way, you'll still get consistent egg production right?
It doesn't make sense to me that you'd have to have food always in front of them. Humans do that and they survive right?