I'm happy when my base time for Grade 2 is around 32 seconds give or take a few "third-stops" - burn exposures up to around 50 seconds and dodges down around 16 seconds. All in "third-stops". Sometimes I'll pick a time in-between but mostly one of the marks.
I have a 60 second electromechanical timer, and a non-stabilized Aristo grid. So short times are out of the question for me. Any finer time distinctions are non-repeatable anyway.
I don't go out of my way to put exposures on the straight line of the film curve just to make this happen, I suppose I could if I wanted to.