I realize that advice may not hold true for every person. But in my experience it seems that those who overdo LSAT prep tend to fall well short of their potential come test day.
The LSAT is not a test of knowledge. It is a test of an acquired set of skills, that can, by virtue of being acquired, be learned and applied through trial and error.
It's like working out. If you want to get stronger, would you work out 8 hours a day, every day for 6 months straight? Hell no. Your body wouldn't have time to repair. Ideally, you'd work out an hour a day, 3 days a week with breaks every 6 week interval to allow your body to repair and adjust to the impacted strain.