Changed default number of sampling fractions to: 20, 15, 10, 5.

This should be sufficient to find good level.
Changing default 5 pct to 6 pct, since 5 pct can give error from nussampler.
Added more timings.

They vary quite a lot.
But they can give a clue about the time it takes.

It should be between 10-40 min, depending on number of repitition.