How Long It Will Take to Upgrade to TFS2015 with Update 1

Introduction TFS Requirements and Compatibility Collection Size based on actual data not attachment TFS Pre-Upgrade Tool TFS 2013.4 to 2015.1 TFS 2012.4 to 2015.1 In

Upgrade TFS2015 Update 1 from TFS2012 Update1 error

I was upgrading from TFS 2012 Update 1 to TFS 2015 Update 1, and encountered the following error: TF400311: The database connection strings are not