I don't find practice planning much useful. This is because what you want to practice depends on previous lessons, practices, moods, etc., and I don't think it's good for you to stick to a schedule when something (for ex: you realize you need to practice lots more arpeggios on a sonata) happens. I mean, if you like changing it every time, sure, but I'd rather not do that at all.
Happy practicing,
Natsu