This is a very simple tool.
For it to predict how many days (or healt updates in hattrick to be more precise) it will take a player to heal from an injury it needs some input from you.
It need to know the player TSI on the day he got injured, then wait for 2 health update and note down his TSI after each and input all 3 numbers into this page to get a prediction of when your player will be healed again.
The higher you set the number in the dropdown box the more precise the prediction will become, meaning that you can try and see how the tool predicts after each healt update and see the prediction become more and more precise. NOTE: The number of doctors must be the same before the first health update and thereafter. NOTE: No training must occur between 1st health update and the last health update given as input.