Description of problem:
as summary.

Version-Release number of selected component (if applicable):
v3.8.10-1 on devel server.

How reproducible:
100%

Steps to Reproduce:
1. Run python-nitrate test suite on devel server. 

Actual results:
There is a 400 error

Expected results:
There is no error.

Additional info:
======================================================================
ERROR: Set, get and change errata
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/lib/python2.6/site-packages/nitrate/tests.py", line 909, in testErrata
    testrun.update()
  File "/usr/lib/python2.6/site-packages/nitrate/mutable.py", line 684, in update
    Mutable.update(self)
  File "/usr/lib/python2.6/site-packages/nitrate/mutable.py", line 63, in update
    self._update()
  File "/usr/lib/python2.6/site-packages/nitrate/mutable.py", line 670, in _update
    self._multicall.TestRun.update(self.id, hash)
  File "/usr/lib64/python2.6/xmlrpclib.py", line 1199, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib64/python2.6/xmlrpclib.py", line 1489, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.6/site-packages/nitrate/xmlrpc.py", line 129, in request_with_cookies
    return self._parse_response(h.getfile(), sock)
  File "/usr/lib64/python2.6/xmlrpclib.py", line 1392, in _parse_response
    return u.close()
  File "/usr/lib64/python2.6/xmlrpclib.py", line 838, in close
    raise Fault(**self._stack[0])
Fault: <Fault 400: ["[('estimated_time', u'Enter a valid estimated time. e.g. 12h45m')]"]>