Sum of component.duration.prolated for each component in components.
abjad> t = FixedDurationTuplet((2, 8), construct.scale(3))
abjad> print t.format \times 2/3 { c'8 d'8 e'8 }
abjad> durtools.sum_prolated(t[:]) Rational(1, 4)
durtools.sum_preprolated
durtools.sum_seconds
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