Around 190 hours on silver.

80 hours is your longest?

I too am pretty amazed at the amount of time people spend on Pokemon.... (especially considering the times people are posting are just single save files, and some of them will have more than 1 file) but at least 1/4, perhaps even 1/3 of my games I have spent 80 hours or more on. (As long as I ignore Wiiware/VC games anyway, as they are not generally full games)

Wii disc games alone I have 6 games with more than 80 hours spent:

MKWii the highest at 322 hours
LoZ:TP - 183 hours
RE4:Wii - 183 hours
BWii - 120 hours
Wii Sports - 115 hours
Endless Ocean - 105 hours

And some games are close, or are very likely to get enough to break 80 hours:

Okami - 79 hours
MP3:C - 77 hours (I sold it, but I will be buying the trilogy so it is certain to get another 3 hours)
SMGalaxy - 68 hours (probably give it another play-through before Galaxy 2)

Plus The Conduit will probably pass that mark next month... I am unsure of what it is at now though as I haven't tracked the last 2 months yet. And with all the content in Tiger Woods '10 I may manage it in that too, but it might be a while.

ugh sadly i'm getting up there, but I usually close my ds screen and leave it on so its not really legit. about 100+ hrs on platinum

350+ hours on Diamond

20 hours

My gawd. You guys play too much.

Well I was on my way to beat Pokemon Blue but someone stole my gameboy :(  so I said screw that!

I think i have 200+ on Ruby,Crystal,Red,Yellow

only 30 on Platinum but i havent finish it yet...

around 300 hours on original blue for game boy color.

Same with red and yellow....all originals...

Silver and Gold around 250. Again Originals...

Emerald only 80 hours +, for some reason the replay value of current Pokemon games are no challange to me anymore. :(

I'm at somewhere between 80 and 90 on Pearl, and my original Blue and Silver files were both deleted (Blue by design, Silver by accident), so i can't properly say, though i doubt either of the other two could beat that. I played a lot less a long time ago.

300+ hours on Diamond