Exactly which version of sabayon did you install? 64-bit, 13.04, KDE? What kind of machine are you running on?
I don't think this will help, but you might try using the upgrade command with the fetch option:
equo upgrade --fetch
If the timeout problem occurs again, repeat that command, and it should resume at the point where it timed out. If it works, which I doubt, when the process is complete and you are returned to the root prompt, type and enter:
(that command with the fetch option only downloads packages. Without the option, it installs the packages which were downloaded by the command which has the fetch option)
I often do it that way, as I have a slow internet connection.
What package is 145mb? LibreOffice?