Break down of tours- 1 hour legacy tour goes through a hall full of products as you learn about frank Lloyd wright, but you don't go into the bundling frank Lloyd wright designed.
2 hour landmark tour goes into the frank Lloyd wright building, into Fortaleza building (legacy tour). The tour I recommend and took.
3.5 hour tour is the 2 hour tour, plus two movies about the Johnson's expedition to S. America for Carnuaba wax.
It's all free, plan in advance though. My tour was packed and they seem like popular tours. i was told a minth in Advance, but i booked through the phone 2 weeks. Tours are Friday an Saturday, but sounds like in the winter they are just Fridays.
The Frank Lloyd Wright designed SC Johnson building is quite a sight. Stuck in the 1930's, it has the same essence you might expect in that time period. Unfortunately, you can't photograph in it, and they spend the least amount of time on this building. It is gorgeous though and everything is very well thought out. Come with questions if you really want to know a lot, the tour guides have the knowledge but I feel the keep it shorter on purpose.
Fortaleza hall is really cool too, but It focuses on the Johnson's expedition the S. America a little too much ( you will see what I mean). Seeing the product line was cool and their museum on frank Lloyd wright is cool too ( what they claim as free time) but I would have rather saw the first building longer.
If you like Frank Lloyd Wright, try checking out wingspread, one thing I would have liked to do while there.