I too am obsessed with playing/practicing my mandolin. I don't think of it in the same time management terms as you, but I do think about practicing or reading about music.
My job requires a lot of windshield time so I listen to mandolin CD music as much as I can. #I also carry a reading stack in the car for when I'm stuck between appointments or have down time, like when I pick up my daughter from school. I try to grab playing time when I can as well. When she has her weekly violin lesson, I'll set in the car playing my mandolin.
My problem is staying focused on using my practice time constructively. I am easily distracted noodling or playing stuff that is not part of my practice routine. I've tried to structure my practices with picking exercises, scales, arpeggios and instructional books. But I drift into playing other things like songs I know or am working on. Consequently, I am moving slowly through the books and feel I'm not making as much progress as I should.
I am self-taught and don't have a teacher, which may be part of the problem. Unfortunately, there are really no decent teachers in my area, so I have to rely on instructional books and DVD's.
Between MAS and practice/play obsession, it is almost like being a druggy. You can't wait for the next fix.
Las Vegas, NV
"Every day brings a chance for you to draw in a breath, kick off your shoes and play your mandolin."