Instead of displaying web search response time with a proper SI unit, Google Web Search introduces few fantastic time measurements for search result returning to users in the All Fools’ Day, 2010 :-)
You won’t notice this little change made intentionally for joke if you seldom bother to look at the response time (this proves Google is responsive at all time?).
With reference to list of April Fools’ Shenanigans of TechCrunch, this and the earlier Gmail vowel failure are only two of the many Google official hoaxes for 2010.
Again, Happy All Fools’ Day!