I have been on fertility treatment for a few months now, and so I am probably having a miscarriage at the moment. :( I have now been bleeding for *fourteen* days! I can only imagine what my vaginal walls would look like if I have been using tampons for *two weeks* continuously! But with the cup, I am as happy as can be expected under the circumstances.
My dh is also happy, because I am not sore and I can take the cup out for a "play session" ;) and then put it back in after, since the bleeding is quite light. I never used to do this (or feel in the mood for it) when I was using tampons.
So go the cup for extended use! I have now been using the cup continuously for two weeks, emptying and rinsing it every 24 hours (at night) with no problems. I haven't seen any other posts about this, so I thought I would mention it.