I have a client that is wanting to have full names in the Action history for their forms. Now I understand this comes from the Active Directory, initially, but if we have the client change the display names in the Active directory, will current users have the new display name brought in within a few hours? 

I want to make the best recommendation and I know we have configured some Find User activities within Workflow that may be affected, so I was wondering if we will have to change it in multiple places or just one place to get the changes to be 100% effective and not affect anything. 

I did not find anything about this in the Help files, your help would be appreciated though.