There is no real minimum or maximum.
Events can work just as well for partnerships of just two or three people as for larger groups. The difference is that, with fewer people we will have more time to think more deeply about specific issues the team would like to explore.
As a guide, the optimum number for getting the most out of these types of events somewhere between 8 – 20.
Groups of more than 20 may require more than one facilitator. This could be someone from your own team – in which case we will need to build in a little preparation time, or I have other trusted coach colleagues that I can invite to join us.