If we've spent any time together whatsoever talking about music, you've heard my philosophy on practicing, but for those of you who haven't had the pleasure/torture, here it is:
I would rather have my students (or myself, for that matter) practicing just five minutes a day rather than trying to "binge practice" one day a week or right before the lesson. Think about it like trying to run faster, jump higher, or lose weight.
If a really out of shape person wants to lose some pounds and get ready for a race, which method sounds smarter: 1) Workout for 25 hours by doing 50 half-hour sessions spread over about two months, or 2) Work out for 25 hours consecutively (one day and one hour)?
Obviously choice 1 is smarter, because if you're really out of shape, choice 2 will land you in the hospital or the morgue!
Anyway, the key is to practice a lot, but over a long period of time. So set yourself up a plan, a place, and go play!