The Instructor Development Course including the IDC prep course and EFR instructor course is run over 10-14 days depending on the number of people in the course and the expected weather conditions. It is immediately followed by the PADI instructor exam in West Bay, Roatan. If you are not doing the divemaster internship with us before the IDC, planning to arrive 4-7 days before the course start date will allow you to do some dives an acclimatize before the course starts. You should not book a return flight until the Saturday after the IE at the earliest. Giving yourself a few days after the IE to relax and perhaps do some specialty instructor training is a good idea if you have the time.