How is rehabilitative alimony calculated?

I know it's impossible to predict what a court will award but I wanted some guidelines of what's "fair" when considering rehabilitative alimony. This is in the state of Florida.

The scenario: both husband and wife are under 30; he works and earns roughly $60k/year; she does not work and goes to school full-time. Earlier in the marriage, she worked and earned roughlyy $35k so it's not like she has no skills at all. She will not consider taking a job right now but probably would if she didn't have the alimony coming in at the current rate. The alimony agreement is only supposed to last until she completes school.

Currently she is receiving about 49% of his *post-tax* salary and I think that is unreasonable, but then again I've never been divorced so I don't know what is fair and what isn't. Her alimony covers her rent, car payment, insurance, cable, utilities, and pocket money; she also got literally everything in the divorce-- all the furniture (every last stick), kitchen wares, TV's, etc and he got nothing of tangible value. They are trying to finalize things without using lawyers but most of his friends think he is getting ripped off, especially since she won't get a job.

Anyone have any personal experience to share or any references? I tried searching online and can only find very vague references to what rehabilitative alimony is and not how to actually calculate it. I know it's supposed to get a person taken care of till they can re-enter the workforce but I don't think that means "pay all of your bills while you refuse to work."

thanks in advance!