3 ms·
The other article given in comments here ( http://www.kk.org/thetechnium/archives/2011/06/the_clock_in_th.php http://www.kk.org/thetechnium/archives/2011/06/the
by StrawberryFrog 15y ago
The other article given in comments here ( http://www.kk.org/thetechnium/archives/2011/06/the_clock_in_th.php http://www.kk.org/thetechnium/archives/2011/06/the_clock_in_... ) has a lot more detail on this.
The paras around the picture "Testing the longevity of materials in space on the MISSE" are quite informative. Testing materials in space... I think they're taking it quite seriously.