Simply put, the lifetime value of a client represents the dollar amount of sales that a client will spend at your business (no time limit), averaged over multiple clients. If you know that most of your clients come for 5 visits at $100 each, then it can be said that the lifetime value is roughly $500. Of course, this number will vary quite a lot, depending on the clinic, low vs high volume clinic, location (low cost of living city like Montreal vs high COL like Los Angeles), etc.