Chances are if the document has not been saved during those 5-6 hours then you may have trouble finding it but, follow the below instructions and see if you can locate a temporary cache of the document;
1) First, if you've restarted since losing the file, look in your trash for a "Recovered items" folder. if not...
2) Microsoft Office has an Autorecovery function that saves some files when, for example, there's a power loss. These files are located in the home folder, in the Library
Press and hold the OPTION key on your keyboard while clicking "Go" in the Finder menu bar at the top of the screen
In Library, open a folder called Application Support.
In that folder are a number of folders, one of which may be Office 2011 AutoRecovery if files are available. Click that, and any files saved by the autorecovery function will be displayed.
3) If the above doesn't work, next, Go to the Finder
select Go in the menu bar and click "Go to Folder..."
and click the Go button.
Look for files or folders named "Word Work File" inside a "Temporary items" folder.
You should option-drag files or folders to the Desktop (or anywhere else) before dropping them on Word's icon. Don't delete anything!
If your file is still cached on the drive somewhere then that is the most likely place, however the cache files do not exist for long.
Recovery of unsaved files is slim so if the above does not turn up a copy of your file, then please don't shoot the messenger. :-)
Sadly, if none of the files or folders were available to be found then no cache of the document remains.
You may want to look over the following help page at your convenience on how to safeguard against loss like this in the future.
Thanks and good luck!