Maybe it's just me, but after 15 years of guitar, I find 15 minutes to be only enough for the barest of skill maintenance. I've definitely hit a plateau in the

Maybe it's just me, but after 15 years of guitar, I find 15 minutes to be only enough for the barest of skill maintenance. I've definitely hit a plateau in the last few years, and I think a major factor is the relative scarcity of available time to practice, drill, and learn new stuff. It was much easier to make progress when I was a feckless teenager.