I have several buzzing around but they won't share the feeders. If one is there, the other will chase it away before sipping. I even have the feeders on different ends of the house. If I had to mix the sugar water every day, I probably wouldn't boil it but 4 cups of solution lasts me about two weeks or so. I put about 2/3 to 3/4 cup in both feeders every other day and they still aren't empty. Maybe next year, I'll have more as this is the first year I've put up feeders.