i depends experience in java before too.
for
me it was almost 7 month (no experience before) - i study 2 day study 2 day not (because of work)
and i also read official tutorial, mala gupta book, java language specification, and make enthuware
test (at this period).
can only advise study book you have and when finish it -> try mock test (one exam (not all at one time) and look at the result - and study weak topic or even all topics (depend of result testing)
if you result not grow from test to test - use another study material. (some time you can overlook some concepts in one book and see it in other)
OCA/OCP Java SE 7 Programmer I & II has at the end of each chapter question - when use it don`t go to next if you have 10-20% errors - just reread all chapter (this way i read it first)
(and about speed 1-6 day is enough if you study full day, as for me (this also depend if English is native language (i read this book first time from 11.06.2014 to 05.08.2014)