WOW, how long should this take? Well. if you are PADI you can do it ina week inthe ilsands, BUT since we are talking SSI, in our shop in western Colorado it will take at least 6 to 8 months. We have one open water class a month and you would work with at least 3 plus just observing for probably 2 (confined and open water). Personally, we feel you should work with at least 3 different classes. But there is no written rules for the length of the class. Just remember as an SSI Dive Con you will be working for the shop and not from your garage as some other instructors can do (according to the standards they are not doing this but we all know they are), so it really does benefit everyone for you to work with as many students and instructors as you can