On Fri, 13 Mar 2009 17:39:42 GMT, (Darren Dunham)
wrote:

What is the problem to postpone the Soyuz launch a couple of days in context
of an international partnership as ISS seems to be ?

One issue that arises is the on-orbit lifetime of the Soyuz. It can't
stay up there for too long before it exceeds its certification. I don't
know how close they are to that....

I've heard the limit is 200 days, which would be April 30 for Soyuz
TMA-13. The Russians probably have an earlier cut-off to allow for
emergencies.

Brian