Having only one is more time consuming...no others for them to play with. I always have 2+ come, other wise I would never have a minute to myself LOL
My DGSs come to visit me as often as we can arrange it. My twin 7yr olds just left and the 5 and 6yr old are coming Sat for a few days.
When they are sick, I bring out the "quiet box." It is full of special things they can do while resting on the couch :wink: and they don't get to play with them any other time :D