You just need to upload the changed files. You do not need to run the upgrade.php script after updating your files.
Read the upgrade.txt in the documentation folder for complete instructions on how to upgrade.
There is a log of changed files but no in reference to what issues.
There are mostly template bugs as one can see by the list of files. I think it unlikely it would take hours to replace 4 php files or 4 templates but then your talking about code modification outside the support parameters so who knows.