I hate to say it but the rears are a lot worse than the front. I watched my shop do it and it took about 30-45 minutes on each side. The fronts seemed to take about half that. It's a great mod for the money though!
I should add that SID is probably right though. My shop had all the tools for the front struts and made it look easy.
If you have professional strut tools that part is cake. Not so much if you're using screw-style spring compressors like most of us would be.