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Nen has played 131 hours on her Platinum version, but the number's bound to change 'coz I play it almost every day. :D And I just restarted my Pearl version, so it's at only 61 hours.
Somewhere around 350+ on my Diamond. I do a decent bit of breeding and I also leave my DS on sometimes and forget about it for a couple hours... but most of it is actual gameplay xD; I beat the E4 for the first time at 16 hours. I've also had the same save file for over 2 years now, so the hours just sort of rack up... xD
I haven't been playing much lately, but I have been clocking in a lot of hours before. In my Pokémon Pearl game, I have about 140 hours or a bit less. As for my Platinum game, I have about 10 or 11 hours clocked in because I don't play it as much as I thought I would at first.
I hope to at least put in some more time in those two games and perhaps then, I'll get around some more hours.