  Longitudinal observations are sometimes costly or not available. Cross
sectional sampling can be an alternative. Observations are drawn then at a
specific point in time from a population of durations whose distributions
satisfy a {\em core model}. Subsequently, one has a choice. One may process the
data immediately, obtaining so called current duration data. Or one waits until
the sampled durations are known completely obtaining the full durations via
length biased sampling. We compare the Fisher information for the Euclidean
parameter corresponding to an Accelerated Failure Time core model when the
observations are obtained by either current duration or length biased sampling.
