Forget the 6 hour one. Basically useless. Other than to get a chance to "handle clay". But if your goal is to be able to do what you mentioned......... not a chance in hell.
Learning clay work takes TIME. There is a large component of experential learning that has to take place... even with the most skilled instruction avilable.
We often joke that 50% of working with clay is "moisture management"....... but it is not that far from the truth. Controlling the consistency of wet work and doing things at the right time is a skill that takes expericene to attain.
There are many sequential steps to the rproces, and there is time between every one of them. Among other thngs, kilns take time to heat up and cool down.
If you don't have the time to invest in that college CE course.... maybe hold off on the whole idea. That likely tells me that you do not have the time it will take to do this at any level that will satisfy you.
Doing it "yourself" will take longer.
BUT........ my guess is that if you try this out for a while.... you soon will be willing to KILL to find the time to continue. Soon you'll be coming home at 4 AM and thinking it was 8 PM. And then you'll be selling other stuff that you own to "feed your habit".
THAT is how clay is.