Recently working with a customer we needed to figure out how long it would take to transfer data from staging database to reporting database for the Web Analytics Service in SharePoint 2010, and this is what I found
You need to turn up diagnostic logging for Web Analytics Services -> Component Controller and Web Analytics Services -> Workflow Templates
Allow Web Analytics to run it’s course over a 24 hour period of time
Look for when the Web Analytics Trigger Workflows Timer Job, you can do this by searching the ULS logs for an entry with this info
Then based on that file take the time from the last line and you have your end time
11/28/2012 12:43:50.70 WebAnalyticsService.exe (WEASP03:0x046C) 0x1418 Web Analytics Services Component Controller c2ey Verbose Executing the service application Web Analytics Service Application completed.
So in my case the process ran from 12:21 to 12:43 for a total of 22 minutes, I of course have a very small environments with very little traffic and I imagine that in your environment the process would be much longer.