Going to Shiodome

I am planning to go to the Shiodome area next week, to have a look at the architecture, shops and what else it has to offer.
My question is: Is half a day enough, or is it worth spending a whole day in that area?
(any points of interest would be appreciated)
Thank you very much.

Please, does somebody know the answer to this?
(i am leaving in 36 hours, so i am a bit desperate:-)

I think an afternoon should do - though we (living in Tokyo) just recently went there and spent a couple of hours just visiting the train history photo exhibition... :) since it's centrally located, if you feel you spent enough time, you can proceed to other attractions nearby such as Hama Rikyu garden or even to Ginza. I don't think you have to plan to the hour... Enjoy your trip!

One suggestion that I could make is to be there a couple of hours then head for lunch at the Tsujiki fish market (about a 10 minute walk from the Royal Park hotel)...

Thank you very much to both of you for your replies.

AK: In fact i already made Hama Rikyu a part of my plan that day. ;-)

Steve: I will take your advice and go to Tsujiki. I havent been there yet, though this is my 3rd trip to Tokyo.

Again, thank you.

Half a day is enough. But I recommend to include a dinner at one of the skyscrapers' top floor restaurants. They have great atmosphere and good food.