How long and how often should I do the meditations from the CHI book?

How long and how often should I do the meditations from the CHI book

Basically, the answer is that it is an individual choice.  For some people doing each meditation just the once is sufficient.  For others they feel they may like to do it a 2nd, 3rd (or more) time - especially in the area of forgiveness.   It's a good idea to do any meditation at any time that you feel the need, and to make it part of your life.