Question

each dialysis session lasts for 3-6hours why ?

Answer 1

Primary methods of hemodialysis took more than 12 hours time.

Progress in dialysis led to shorter  time, about 4 hours.

Because I know already some complications associated with hemodialysis is a result of rapid change in blood chemistry, and on the other side the long time of dialysis is one of the major problems of dialysis patients. How new methods in future would be possible to compensate this rapid fluid removal and rapid electrolyte disequilibrium? I think restrictions from this point of view hinder decreasing in length of time and frequency of dialysis in future.
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