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It does take some time to learn enough skill to actually “sound good”. How long? There isn’t a universal answer to that because of too many variables. But most people will probably need somewhere around 2 years, give or take 18 months to adequately integrate some of the most basic guitar skills into your subconscious.
It used to be believed that it takes 10,000 hours to master something, but that is generally not accepted as fully true anymore. For discussion purposes, let’s just assume thee is some truth in that estimate. If you devoted 40 hours a week then it would take 5 years to accumulate 10,000 hours. Members on TAC report they spend 15 minutes to maybe 180 minutes per day but I have not heard of anyone claiming to play guitar for anywhere near 40 hours per week. I know a professional guitar player and he isn’t close to 40 hours.
The point is that even if it takes 1/5 of 10k hours to acquire “mastery”, it still would be quite a large of number of 15-180 minute sessions.
Instead of fixating on wanting to “sound musical”, try to direct your attention to incremental improvement by measuring periodically. That’s why we have the benchmark weeks where you are encouraged to record yourself and compare your playing to what it used to be. Personally I look for something to take away from every daily challenge, something that went better than expected or some nugget that I learned in the current session. It’s important to identify it and write it down. When you write it down you might also post it here on TAC as this lifts others up as well as yourself!