Need to correctly adjust default time budget

[DurieuxPol]

Also, the budget is a bit hard to adjust, because most of the time the tests don't take much time to run (less than a second). So to make sure that a least a few mutants are evaluated I multiplied the total test time by 30, but it's a bit random. And even multiplying by 30 there is often no mutants evaluated.
So should I increase this number up to 100 for example ?

Originally posted by @DurieuxPol in #110 (comment)