After a pretty awful experience with ToTW (they did fine-but the feed store sold really broken looking bags and didn't care when I complained), I'm looking into Evo. But how long do the 15.4 bags of food last, if the 2 cats share a 5.5 ounce can of wet 5 times a week? They're 8 or 9 lbs, pretty normal activity, 11 years old, and they don't have any health problems.