Sparse free version with timeout

[louif]

I am using the Cula Sparse free version to test if it can be a solution for a fast solving for impedance problems, my objective is to acheve under 10ms for all test, while it is around 6-7ms for the majority of the test, some takes way more time, like 100-500ms, but if i look at the result msg from the solving, it says the solution was found under 7ms, also these test that takes long time are always the same number, let's says I do 10000test, it will always be the same 5 tests that will take way more time. I was wondering if it was something on purpose on the free version, and is there the same thing on the full version.
Thanks