The number and type of conversions that occur when you upgrade to a new release can have a significant effect either during the upgrade or during normal operations after you upgrade. More conversions occur if you are skipping a release level. You need to consider the time for conversions in both the release you are skipping and in the new release.
To estimate the additional time that conversions might require,
you can gather information
about specific object types on your system. To review conversion information
from a skipped release, see the software upgrade information in the iSeries™ Information Center 
for
that release.