Welcome to the Ranch,Poobhathy kannan. I don't think it would be enough to digest the EJB knowledge in details... Oh, but if you are not working, it may be possible... For me, I read the book twice and do as much mocks as I can till I am confident on the questions... So be wise about it...
Co-author of SCMAD Exam Guide, Author of JMADPlus SCJP1.2, CCNA, SCWCD1.4, SCBCD1.3, SCMAD1.0, SCJA1.0, SCJP6.0
I really think three ours a day for one month long is enough time to study SCBCD, certainly when you already know and use the basics... I also knew the basics, studied the HFEJB and spent my last complete weekend on learning things by heart, studying the specs on difficult issues and making mock tests. And I passed with 97%... So go for it !
my learning tips: HFEJB, cheat sheets from javaranch, this forum, the EJB specs and as many mock tests you can find (i liked ejbcertificate.com which is free).