Believe me, that is the last thing you will have time for at OCS (especially the first 9 weeks). While you get some "free time" in the evenings, it is almost always occupied by: class drill practice, studying, polishing your boots, preparing for upcoming inspections, hygiening, etc. If you have a Big 4 billet (Pres, VP, Med Body, and Adj) you have even more stuff to do.
Pshh, I read the entirety of that history of the US Navy book they give you for that one "class" in the first 9 weeks and I was an honor graduate.