When i was in Music School, many, many moons ago, I was informed that I was required to practice 2 hours per day for each hour private lesson which I took at the university. Let's see, 2 hours per day on voice, which was my major, and 2 hours per day on flute, which was my other major, although they only allowed us to have ONE major, and then 1 hour per day on piano which I also took all through my years at the university, and 1 hour per day when I took Euphoniun (aka Baritone Horn) lessons for aobut 4 semesters, and then I directed 2 choirs (we had 2 different services, thus 2 choirs) and I taught music lessons-guitar, piano, flute, etc, and as I recall, the first year I was in school I counted the hours I spent in & out of class on music school--72 hours per week!! Not to mention all the the hours I spent on my "regular" classes such as math & history & science & the rest of the stuff I never had occasion to use again in my life. Oh, yes, and now that I'm old & gray, after work I teach music lessons, and I go to the session (Irish, of course!) about once a week, and a couple of festivals per year (gotta go to Winfield!), and now & then I play weddings, funerals, & I'm in a couple of bands, volunteer at a local museum playing music about twice a month. Come to think of it, I don't think I ever practice any more!