Hard to say the approximate time required for the Mavericks OS X 10.9.5 to download
and what else it may require while online to be a complete volume; that it may also
look for other bits to update or finish the process may add unknown time to the total.
Since your internet portal has a limited ceiling, shared across all means of access, to
be using it much during the download duration while Mavericks is attempting to also
download, may slow your local network access and add time to the total process...
And the idea to use Ethernet cable instead of wi-fi, should help by a notable degree
since it is faster than wireless. To be on-hand while the Mavericks installation is
supposed to be happening, may be convenient just in case there may be a glitch or
some interruption in the internet download process.
Not sure what you may glean from reading other materials with the PC while the Mac
is getting a re-install of a system, some of the Support materials can be helpful if they
are applicable in the correct time sequence to their intended purpose. The Apple
Diagnostics page covers a few things that could be done while access it via internet.
Note the reference to using Safari while viewing part of the topic in there. However it
does not hurt to read things if their context is accurately assessed for later usefulness.
Keep in mind the total combined use of your internet will affect the time a download of
an operating system file will take to occur; since the upgrade or replacement OS X from
the Apple server can take some time. And the stated download or upload specs from the
IP may not be real-world numbers. -- I know my internet service provider's are optimistic.
Good luck & happy computing! 🙂