I mean a lot.  Mainlly between classes when I was hanging out in the computer labs.  It is a very very basic game.  Apparentlly they added on to it sence I played it (there wasn't a final boss, you couldn't combine what you were mining, and there was no final boss I could ever find, I got pretty deep) but I did love the mindless mining.  It was fun.  I mean the new one can't be that bad as long as they didn't go too far from the source.

PS. I am Curious if anyone played like I did.  I would litterally clear ever row going down.  There would be nothing but open space between me and the surface.  Sometimes it would glich and add some areas of dirt that shouldn't have been there.