I did the 90-Day Challenge earlier this year. While I think it was an accomplishment, I didn’t comprehend anything. It was too much like a task and I didn’t have time to absorb what I was reading.
Reading nothing but the Psalms for 7 or 8 days straight could make your mind go numb.
Like all bible reading plans, it’s not for everyone. The important thing is to keep on reading. :-)
You might find this plan of interest:
http://pastorbrett.wordpress.com/2009/08/25/professor-horners-bible-reading-plan/