How does the length of common limb affect absorption?

I thought I had this whole RNY process figured out until I had my second consult today. I was informed that the length of the common limb would be a total of approx 120 cm and that the length of duodenem/jejunim bypassed would be 30-40 cm, with a total bypass of approx 160 cm...(Dr's math) What the heck does all that mean and does that mean I'm not going to have any malabsorptive properties to speak of? I found very little in the library on this and what I did find only confused me more...help!! (lol) Thank you!

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