This depends on your goals no? For example, I ‘studied’ Jim Venetos’ system for a few months. I felt it was easier on my body and ‘easier’ to perform than the conventional swing I am working on with my pro at my course and previously with my Evolvr instructor. But I also realized I was limiting myself as distance with my long irons was lacking. I’m not incapable of improving my conventional swing. And I know if I can achieve the 5 simple keys developed by @iacas and others I’ll have a higher ceiling for improvement.
Nobody hits more balls than me in a normal week considering I have a full time job. Golf is unique in that practicing can be done wrong and actually show zero improvement. If I spent 12-15hrs/week shooting free throws or 3 pointers I’d be a better shooter 100% guaranteed. But I can put that same effort into ball striking ( not putting) and go out and shoot my worst score in three months.