OK, so back to clamps....how long is safe to leave them on? M has some nasty little jobs he got at the hardware store, and only once have I flat out refused-it was after a lot of pretty hard pinching/pulling (over a 2 day period) and the pain of them being on after that totally transcended into the This Isn't Fun Anymore zone and I flat out told him to get them off! (I really thought they might pop right off....my nipples, not the clamps!)