if I have nothing else to do (not often) then I will engage in small talk with a parent, sometimes the last parent of the day gets a little more of my time. but usually I will help the parent get the child ready IF needed, then will move on to another child to change diaper or care for, or go about sweeping the floor and other duties, to kindly let them know I am still at work. havent had too much trouble with parents staying too long, if you do the routine of getting the childs coat and boots and saying goddbye to the child, the parent usually knows their cue to go, and IF NOT? thats usually when I go about sweeping or taking care of others, just a subtle hint of body language.