I don't see how you can go from no spin experience to proficiency in much less than 5 hours. And quite frankly, anyone who goes out practicing fully developed spins on their own before they are proficient needs their head examined.
What you seem to be missing is the fact that (generally speaking) the only folks who attain proficiency (and maintain it) with
all the spin modes are aerobatic pilots flying Pitts and Extra types. What you also may not understand is that for the newbie aerobatic pilot obtaining this type of training, there is a
single emergency recovery technique that recovers
any spin type in these airplanes without even having to know what type of spin you're in - that is to pull power off, and visually neutralize all controls, look at the ASI, and wait for the airplane to start flying again. You don't even need your eyeballs outside the airplane. I know some may find this hard to believe. For those folks, again - go fly with the master - Bill Finagin.
That is
emergency recovery, and yes, a pilot truly can go out and practice all spin modes by themselves once they have mastered this single technique....even if they have not fully mastered or developed 100% comfort with the
proactive stick and rudder inputs to
most quickly recover from each individual spin type. Again, I don't generally know of pilots doing inverted flat spins in many airplanes other than Pitts and Extra types. This technique works in those airplanes.
Believe me, being highly active in IAC I am tuned into how much training pilots receive with this stuff, and what it takes. I have NEVER heard of anyone spending 5-10 hours on aerobatic spin training alone. 5-10 hours will take a competent J-3 Cub pilot with little to no aerobatic experience and fully transition them into a Pitts, which includes a whole lot of takeoffs and landings, basic aerobatics, and yes - some aerobatic spin training. But no more than about 25% of the time would be spent doing spins of all types. The pilot will be safe to proceed on their own after this -
safe being the key word. True proficiency and a high level of comfort will (and can only) happen through practice on your own - again unless you have unlimited $$ to invest in many hours of ongoing dual. I don't know anyone who does that.
The statements you are making lead me to believe that you have not attained true proficiency with all of these advanced spin types, which means your perspective on training does not include a full understanding of the realities of all this.