If you can get a teaching qualification in a year, after doing 30 hours then of course you can get the same thing in six months.
As long as you do the same 30 hours.
Heck, you could even do it in a week!
Quite often study is for only a few hours a week, there is no problem in increasing that time per week, doubling it etc - thereby reducing the overall duration of the course.
Remember that this is aimed at professionals, people who would be capable of taking in the information that they need to learn, they do not need to learn the subject as they already know that - just how to actually teach it.
Are we by chance short of teachers then?