neahleemusic.com. 

check it out. 

just one letter, right? 

not exactly. 

1,000,000 seconds = 11.57 days 

1,000,000,000 seconds = 32 years (roughly) 

got that from an entry from a guy engaging in an awesome project about another guy who's doing the same (albeit with a differen focus): http://eugenecho.wordpress.com/2009/06/19/visionaries-are-crazy/#more-5123

good, inspiring stuff