I receive weekly updates from a few site monitors. Some are sales gimmicks and some have interesting information.
Today one of them mentioned that of the over 1 million sites they are monitoring, the average down time is almost 1 hour. Over a week that doesn't seem to be too bad. 24 x 7 = 168 hours so one hour may not be a problem.
But, if that hour is during the time a customer was searching for you, it could be a problem. Such a small amount of downtime is less problematic than other Internet issues. Most people have learned that occasionally a server is down. If that happens, simply refreshing the browser or returning a few minutes later can provide the solution.
So spread the word that if your site appears to be down, it is probably a momentary glitch. Refreshing or retuning in a few minutes will help. Also, encourage anyone who sees your site down to tell you. It may be something that requires more action.
Hey! If you see my site down, would you mind sending me a note? Thanx!
Happy listing and selling real estate!