Need a little help with interview

I have been interviewing with Deloitte over the phone, for the past two months, and day after tomorrow is the fourth phone interview. Does anyone know if this is a normal practice? The position is with the FAS group for their real estate practice. I am an MBA graduate, and had applied for an entry level position!

Also, would really appreciate it, if someone could give me a general idea of what to expect in this interview. I have already spoken to the a manager, and a senior manager, and this one is going to be the director of the group. So, as you can expect, I have already walked through my resume, answered behavioral questions, and talked about my professional experience.

I m kind of at my wit’s end, as to what I should be doing in order to prepare for the next round, and am at tenterhooks, because I don’t want to blow it up either by not preparing! Now that I m thinking about it, nothing has been asked about finance so far.

I shall really appreciate any help that you might be able to offer.