It may seem counter-intuitive, but because your LSAT score is good for 5 years, your prep timing should be more dependent on when you can be ready to take the LSAT and not so much on when you are ready to go to law school.
If you are thinking about taking the LSAT on December 11, 2010, it's almost time to start prepping. That means you need to start planning your life now if you want to maximize your score potential. Being able to practice the LSAT for six or more hours for at least two days a week is an intense time commitment: you need to plan out a schedule of work, class, and personal commitments so that you can devote at least 20 hours a week to the LSAT for about 4 months. A significantly longer timeline than that will either dilute the practice difficulty or use up all the available PrepTests, while a significantly shorter timeline can cause burnout or result in being unprepared.
The quality and length of preparation are the best predictors of growth on LSAT performance, and if you truly wish to maximize your score, the ~4 month Zen of 180 LSAT training calendar is what we suggest.
Below you'll find the Zen of 180 public Google Calendar with our suggestions and annotations for both the October 2010 and December 2010 LSAT self-study programs. Below that you can watch the YouTube video to see how to add the calendar and customize it to your own needs.