I know how you feel. Mine was the same way (and I was only there for 4-6 hours at a time). I went in expecting to be ran ragged with things to do but in reality, there wasn't much at all other than feeding the patients. By the end of our time there, my instructor ended up grabbing a bunch of us students, finding an empty room, and we practiced skills on each other. We didn't get to do catheter care and things like that obviously, but we got to practice quite a few skills that way. (ROM, changing occupied beds, transfers, we practiced bed baths with clothes on, etc) Maybe see if your instructor is willing to do that with you when things get slow?