by jmoore » Thu Apr 28, 2016 6:41 pm
Depending on the size of the database, the upgrades can take one to many hours of clock time, but it primarily consists of launching a small number of scripts. The top person time is configuring a system with the updated requirements of newer versions of OMERO, and is dependent on how well someone is familiar with the various prerequisites (Ice, PostgreSQL, Java, Python, etc.)
Hope that helps.
~Josh.