In my most emotastical years, I'd turned t' Pokemon (the games, Ruby and Sapphire in particular... beat 'em seven times each at the least [that's definitely a few hundred hours]) and Yugioh (the TCG). Both of which were essentially never ending pastimes, likely why I grew attached t' both. The former is an endless collectathon of rare monsters and daily events, whereas the latter is still an expanding game t' this bloody day. Yugioh also filled the void in my life known to some as "socializing". Bleh.
Oh, and anime to a lesser extent.