60 gallon fresh, 30 black, 35 gray
For hubs and I, we have gone from a Wednesday afternoon to a Monday morning, with minimal dishwashing (paper plates!), each with a daily navy shower. The indicators usually show the black to be 2/3 full for the last day or so (I know they aren't entirely reliable). Also, this experience is at a music festival in 90-100 degree heat so we're drinking a lot (both non-alcoholic and alcoholic beverages). We also do use the facilities inside the festival while we're in there for 4-6 hours a day. I'm guessing we could probably make it another day or two, especially if we aren't drinking like college students :-P
We've never even come close to running out of water. I frankly wonder why they designed it with such a large water tank, but such a small black tank.