There are 19 groups, each with 172 tests. I ran the 99th test from each group, and it took a total of 6 min 44 sec. Multiply that by 172 and you get approximately 19.3 hours to run the full set of tests.
As a bonus, the tests are currently only implemented for .NET 3.5 and .NET 4.0. No clousot tests are run against Roslyn yet.