I think the issue really stems to how you want to learn to dive.
Eg you can do your Advanced Open Water from complete novice (through OW) in 2 weeks in Southeast Asia (eg Thailand) relatively cheaply. However, whilst its easy to pass the exams and the instructors will help you with the answers, it doesn't really teach you to be a good diver..
If however you want to actually learn things and take your time, which is my preferred route, it can take you a long time. I waited until my 30th dive to start my AOW, and even then I only did it because I was diving in the Red Sea, and there is a hell of a lot more to see at 30m with all the wrecks. But I was a much better diver than I would have been if I'd done the quick route.
I've never done dry suit diving but I'd imagine that, much like normal diving, its time in the water and experience of how you maintain buoyancy and control, and that knowledge that helps you out in a potential emergency that makes you competent, rather than taking what are relatively easy 'qualifications'.
I'd certainly be taking my time over Ice diving.