Replying to JD/MBA joint degree program

I'm not sure how many other schools offer this, but I am applying for the joint degree program at Seattle U for my Juris Doctor and Masters of Business Admin. I know there are some older NSers on here who have grad degrees and I was wondering if this might be taking off a bite to big to chew? The program last 4 years and while my original intent was just law school alone, I do want to practice business law so I think this could be a worthy pursuit. I know one's life pretty much ends in grad school alone, but any input on experiences would be appreciated. Also has anyone taken the GMAT? I have the LSAT all taken care of, but this is one more test I would now have to take and I do not know too much about it and how much time to prepare is appropriate. Thanks!