EE6 EJB certification (old SCBCD) preparation span

Hi folks!

I want to take the subj test and don't know how much time to save for the preparation (I have to pre-order the exam well in advance).

My background is the following:
- only basic understanding of the technology (on the level of what EJB means),
- more than 5 years of practical experience in almost everything but EJB (so there is some understanding of EE patterns),
- SCJP and SCWCD.

Will 4-6 weeks, 3-4 hours per day be enough to prepare? I am going to use 'EJB 3.0 in Action', specifications, and EE6 tutorial from the site (will it be enough for restructured test?).

If the time is inadequate, how much time do I need?

Thanks for your time!