The tour itself (the free one) only took about 30 minutes, and then you buy the tasting set and get a table for 30 minutes. The tasting is three types of Sapporo beer.
The tour that you must pay for, seemed longer and you are with many other people. There are reserved tables for them to use, but with every taste they seem to have to do some chanting beforehand; loud enough for everyone in the room to hear.
All in all even the free tour was a lot of fun.