If you are just visiting, stay no more than an hour. If you are going to do dishes, do laundry, and/or hold the baby while she showers/eats/naps, then stay as long as you are being helpful. If you aren't helping, and the baby naps when you are there, that is your cue to leave so she can eat/shower/nap. Bring a meal that does not require a lot of prep or make a lot of dirty dishes. Or do the dishes if it does.
It exhausted me to have people visit, not help, and expect me to entertain them, and then they left without helping with the mess from cooking when they were here. Honestly, I would have preferred they not visit if they were not going to be helpful until I got into a new routine and was fully recovered from childbirth.
