ofcourse you can.
just pr and activate as much as you feel comfortable in the time you wish to devote to reading the books. the purpose of the plan is to compare the results of the first 5 days with the second 5 days period and notice what you gained compared to normal reading. so just have fun with it. in hebrew there's an old saying which i'll translate : "ye caught alot- ye caught nothing" so my point is:
devote how much time you want to devote, which you'll know you'll manage to achieve your goles without stressing yourself away from it. your purpose now is to notice the experience. and if you won't finish your reading you will finish all your reading at a later time.
hope this helps

Raanan Hadar