I have a ridiculously busy life but make time where I can, I get 40 minutes lunch break at work and use about 25-30 of that for practice at least 4 times a week, then I practice every night between 7 and 8pm when my daughter is watching star trek voyager (yes I know), then we do a 2-3 hr rehearsal at least every other week and usually two or three times in the week leading up to a big gig if we have new material. I even bought a cheap travel bass to take on holiday last year! I think the secret is to find small pockets of time you can squeeze a bit in, even ten minutes messing about with a new part or keeping something fresh helps. I have a very structured system as well (thanks to something I read on here ages ago), so I make sure to split the time up between a fun warm up, technique, new songs and then practice of stuff on the set list. I go over the whole set list over a period of 6 days. I love doing it and I am not the sort to sit in front of a tv for hours so it fits in well for me.