Report Data Refresh Rate

I am attempting to run an exchange report and having difficulty having the data refresh. As I look at the report I find AD information that needs to be updated (title, department etc.). I am updating it in AD then go back in to AD Manager and can see that the changes have happened when I look at their profile. However when I run the Exchange report and bring in "Department" I still see the old information. I have tried to force the update through Domain settings and refresh but I cannot get the report data to pick up new AD information. There seems to be a delay. What is the refresh rate on this? How can I get the same data I see in my AD accounts in AD Manager to pull into the reports as I do it ?