I can only answer from my experience, Justa, so here goes.
I started learning chords at 17. Graduated high school that year, then a cousin 10 yrs older moved here from California after a divorce. We worked together days and played guitar at night. He showed me how to play flatted 7th chords, minors, etc. and some bass/rhythm patterns.
I joined a band at 22 and thought I was a guitarist. HAHAHAHa!!!!!!!
3 chord country songs and the lead from "blues eyes cryin' in the rain", yeah, I guess I qualified as a picker, but man, did I ever have ALOT to learn.
Played in 3 more bands in bars every weekend for the next 10 yrs, and improved some, but here's the crazy thing.....
The more I learn, even the more I practice (like I've got time nowadays,LOL), the more I realize how much more there is to learn and how much I really don't know. And that's not a smart-a$$ed answer to yer question, I find ,as I progress, that it is a learning process without end, if you choose to make it such. If I had wanted to stop learning after I could play "House of the rising sun", I could have quit 30 yrs ago. It's not the destination, man, it's the journey...:drool:
NOW... to answer the original question you posed..
For me, about 5 yrs, when I joined a band. I could fake my way through most songs if I wasn't expected to play the lead note for note like the record.
If I knew the key the song was in, and the chord progression, I was comfortable playing in front of people. If I had a lead break, I knew the scales well enough I could play something that fit the tune. There were (and always will be) players out there with more ability, agility, and knowledge than I have, but I play for the fun of it, and as long as you have the fun, and the ability to laugh at yourself, yer good to go.
I learned a couple of very important lessons a long time ago...... in front of an old black and white TV on Saturday morning...... from Bugs Bunny.....
"Don't take the world too seriously, you'll never get out of it alive"....
" Remember, Doc, it's nice to be important, but... eh, it's more important to be nice".....:rotflmao:
Hey, I see just strum heard the same quote as I, enjoy the journey, don't worry about the destination.
Man, if I'd wondered how long before I got good 35 yrs ago, I'd of given up...... the funny thing is, I never gave up, and I still don't think of myself as good...... but I'm self-assured. Not self-insured:rotflmao: