How Long would it take to finish your Steam library?

If you're part of the PC master race then you probably have a massive catalogue of Steam games. but like everyone else, there are those few games you buy, play an hour off and uninstall forever because it was like a £1 or something. So have you ever wondered how long it would take to get your moneys worth by completing them all?

A new website titled "How long to beat steam!" takes your Steam ID and calculates your current rate of play for all your games and average play time of each game and tells you how long it would take to complete all your games.

For example my Steam library would take 4 weeks 2 days and 6 hours to complete with 24/7 playtime. 

How long to beat steam?