Mrs J
Average times are 5-8 weeks although it can be longer.
If the DM thinks that there is compelling new medical evidence then they will send your file back to ATOS for an updated report, this may delay the process, a new Decision will then be made when the DWP receive the information back. If the DM does not think they need further medical advice then they will simply make a new Decision.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems 
