Weird... I've never actually heard this.
The only standards I know of are the SMPTE and THX standards which, for an HD image, recommend from about 1.5x to 2x screen WIDTH. This is far closer than what you are listing, but is the standard used with 720p projectors in the home so that a fully resolved HD image does not reveal individual pixels.
So, for a 34" diagonal, we will call a 30" width, and about a 45 to 60 inch viewing disance... 4 or 5 feet.
Go big!