Valve has published player stats gathered from those playing Episode One in the two-week period ending June 26.

How long did it take you to complete Episode One?
How long did it take you to complete Episode One?How long did it take you to complete Episode One?

Thanks to Steam's data gathering capabilities, Valve has been able to put together some stats regarding Half-Life 2: Episode One. The most striking is that only 25% of players actually completed the game, despite 47% of players having reached the final level. Either this is a serious case of lazy gamers or as Valve suggests, "players are quitting before they see the credits, or there is a bug in how we collect this data."

The average completion time is a smidgen over the five hour mark at 5 hours 2 minutes, and in total Steam has logged 895,620 game sessions at an average of 37 minutes a pop. You can check out the full list of stats, plus some lovely looking graphs over at Steampowered.com.