5 hours, expecting another 40 hours.
Checking the installation log, the installer started, 5 hours ago, to copy /usr/local sub directories one file at a time.
I have made an average of 10 files copied per second.
Since I have installed a lot of stuff in the /usr/local directory using Homebrew, added a lot of gems in my Ruby of Rails projects and use rvm to manage many versions of Ruby, I have a lot of these tiny files. Just with Latex or X-Windows packages and the dependency packages, there is more than 1.3 million files.
So, 40 hours to wait.
One issue (question) remains: what happened when the installer log shared buffer has reached its limit (128 x 1024 lines): did the installer continue to copy files or the logger creates an exception capable to stop the whole process?