Time between appliance change

I usually go 7 days, I don't know why you would have to change every 5 days. Changing too often can be bad for your skin.

There's a balancing act... your skin gets "dirty", sloughing off dead skin cells and releasing oils and stuff, even when it's under the wafer, so it's good to remove the wafer and wipe it down (just plain water is fine) at regular intervals. On the flipside of the coin, as summerstorm said it's not good to change too frequently because often removing the adhesive can remove the top layer of skin with it and cause a little irritation.

I would say only you can know what's best for you. I believe that some of the manufacturers' instructions with extended wear flanges indicate up to 10 days of wear, so someone out there who has tested these things thinks that's OK.

I have always used a one piece and I change every 2-3 days. I could go longer. But my work schedule determines it for me. I'm a truck driver who is on the road 5 days a week. So it depends on where I'll be and what my delivery schedule is. So I pick my changes to fit my schedule. I also do heavy lifting so I don't like to go too long, especially with the heat of summer. This is my second summer with an ileo so I have last year to go by. The second time around has been much easier. I think it actually sticks better in the summer. That was a big concern going into the first summer. Heat, sweat, causing a problem. It hasn't happened. But the 2-3 works so I'm sticking with it, even when I'm home.