Sometimes when I'm led in bed at night, I think about this.
I've been playing for 38 years now and have reached a certain level on the instrument.
I think to myself if i had practiced ruthlessly, every single day, putting in 6 plus hours, not just doing what i fancy, but laser focused, structured learning, only stopping for eating and sleeping, how much quicker could i have got to the same level?
I come up with something around 6 to 9 months.
Feel depressed that i could of reclaimed 37 years of my life, and go back to counting sheep instead.