Last modified: 2007-11-14 15:08:21 UTC
The block and protection interface use the GNU standard for durations, which is pretty intuitive for English speakers, but much less so for those who don't speak english; MediaWiki's admin interface should be available to them too.
For the block page interface you can use [[MediaWiki:ipboptions]] to localize the durations.
For the protection interface see bug 10188 -> marking this as dupe.
*** This bug has been marked as a duplicate of bug 10188 ***