We feed our cats dry food twice a day. I have a scoop that is...hmm, I think probably either a 1/2 cup or 3/4 cup scoop, so they each get one scoop in the AM & another in the PM. Most days they don't eat quite all of it before the next feeding.
Lately, since our older cat has kidney problems and is always dehydrated & has lost weight, the vet wants her to eat some canned food. So we give that to them a few days a week in addition to their normal dry food amounts. But we only serve about 1/4 cup of canned to each of them at a time, I'd say.