Also, this may be helpful for anyone who wants to search the forum -
If you type into Google " site:forum.mrmoneymustache.com " followed by whatever you're looking for, it searches only this website for those search terms. So, for example, to find the thread I suggested above, I typed this into Google:
site:forum.mrmoneymustache.com hourly return of invested dollars
Searching using this method has been very helpful to me in the past. Hopefully it'll help someone else too!