The Receivables Aging process in GP can take some time if you have a lot of outstanding AR. There is an easy way to speed it up though. When running the receivables aging process (Sales on Navigation Bar, Pick Aging under Routines) select the No Report option. This means that the aging code can run without having to compile all that data into a report. Let's face, if you have a large number of outstanding receivables, you don't want to work off a monster aging report anyway. You'll re-run it and limit the results to be better aligned with your collection efforts. So save some time and turn off the report.