Retreat workshops typically last around an hour and a half and include a very brief introductory discussion of how and why TRE works, followed by grounding exercises, then the TRE exercises, followed by Q and A.  I often end up doing follow-up sessions with retreat-goers either in a smaller group or individually.  Pricing varies depending on location and number of participants.  As these workshops require quite a bit of attention, I cap the number of participants per session at 14.