I've only taken mine off for MRI's, otherwise, it's been tied on for a couple years now.  I asked the riggers @ CK for a length of old parachute line.  I daisy chained the line and put the closing pin on it and tied it around my neck.
  I shower, swim, skydive, etc with it and it's still in great shape.  Normally, I keep it tucked into my shirt.  It's more for me then others, but I think I might start wearing it out more often now that I'm thinking about it.
  ep