Don’t take this the wrong way but I’ve always wanted to know if being on dialysis means that you never take a number 1? If so, you probably make up the 3 1/2 hours back.
Interestingly, I had to go about a week without dialysis a few months ago. And, oddly, after a few days, my kidneys started making more fluid than usual. They weren't removing the toxins like they should've, but they were removing the fluid and doing a passable job of keeping my blood pressure under control.
The body is a very resilient machine.