The 180 challange was given to our students. What we gave them was 1 complete LSAT that they had not been exposed to previously and asked them to take as long as they needed to work out each question. If they weren't sure, they should put that question aside and come back to it later. Most students worked on it a little each day for between 1-2 weeks.
We call it the 180 challange for all the people who presume time is their biggest enemy. We basically ask them to prove it by taking a test completely untimed and tell them to try to get a 180 then.
The test is due back to us at the time they take their second diagnostic exam, so that we can compare their untimed results with their timed results. Although people obviously do better given all the time in the world, the results of their untimed vs. their timed had an extremely high correlation. This means that although they scored better without time constraints they did so relative to everybody else.
As a general rule of thumb, the number of questions missed timed was double that untimed. This means that if you are shooting for a 160 timed (about 30 wrong), you need to be able to take an untimed test and miss only 15.