code: def build_stats_for_chain(self, build_chain_id):
          
          json_form = self.__retrieve_as_json(self.build_chain_path % build_chain_id)
          builds = [{'build_id': build[u'id'], 'configuration_id': build[u'buildTypeId']} for build in json_form[u'build']]
  
          return [
              BuildStat(
                  build['build_id'],
                  build['configuration_id'],
                  self.__build_duration_for_id(build['build_id']),
                  self.__build_start_date_for_id(build['build_id']))
              for build in builds
          ]
docs: Returns a list of Build tuples for all elements in the build chain.
  
          This method allows insight into the runtime of each configuratio inside the build chain.