add step duration


git-svn-id: https://gnunet.org/svn/gnunet@33300 140774ce-b5e7-0310-ab8b-a85725594a96
header 


git-svn-id: https://gnunet.org/svn/gnunet@33301 140774ce-b5e7-0310-ab8b-a85725594a96