While I still had a P800 it sat in about 25% humidity, which is toward the lower end of the range in the specs. It did go for days and sometimes longer unused. Sometimes there were no deflected nozzles on restarting it, sometimes there were. When there were, I cleaned them up with a light cleaning cycle. I didn't experience any protracted repetitive cleaning sessions as I did on certain previous printer models (4000, 4800, 4900). So on the whole I would say well-behaved. Over the time I had it (a year or so), it did not self-trigger or request the user to trigger massive cleaning episodes that consume gobs of ink, such as I experienced once with the Canon Pro-1000 (involuntary) and once with the Epson P5000 (voluntary but persistent nags on the LCD till I did it).