The average coaching relationship lasts one year. Some coaching relationships are just a few sessions and others continue for several years. For internal training programs, in the program manual, provide the parameters for the duration of the training commitment. That depends on the goals you have.
I can usually give you an idea at the end of our first conversation about how long I think we would need to work together to achieve your goals. It's not uncommon for new goals to emerge during a coaching engagement, and when that happens, people tend to expand the coaching task. In every case, I am there to help you achieve your goals as effectively and efficiently as possible. The average coach's commitment lasts 3 to 6 months.