PbP Questions., The more you know... Options

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So, I'm not really sure if this is the right place to post this but I couldn't really think of a better area. I've been trying to get into a PbP game because I can't find anyone in my area that will get down to gaming here, and I also have a ridiculous schedule anyway. I was just curious how long PbP games tend to last (there's a thread in WtS about people looking for games and incited a whole bunch of ideas about how short lived many have been). It seems to me that most of the games currently running there haven't been going on all that long really (month or two) save a couple. I'm also interested to know what people find as drawbacks/advantages there are between PbP v. Tabletop gaming, what brought you to that type of game. I'm new to the whole idea so I guess overall I just want to know more about the experience too. (IMG:style_emoticons/default/rotate.gif)

*edit*I guess there were far more longer running games up there than I realized after a second thorough glance! (IMG:style_emoticons/default/smile.gif) Still wondering about how average that is.