Mine took less than a week from that point. Think they send it second class post.
If you are needing it to be on the DBS Update service and you have not already done so, then do that now. You will need the Application number or the Certificate number - the online tracking system will give you one if not both of those. Register for DBS Update Service Make sure you make a note of your Service ID when it is shown to you. Do not use a mobile browser as the site has a popup which seems to be tricky on some devices to access.