The Gundam statue was visible from the train which drew us back to it after we visited the Miraikan Museum.
We happened to be in the area at the 1pm and it repeated every two hours from 11:00 until 17:00. The transformation itself was pretty quick and finished in around one minute. Nothing too exciting. The night shows, starting at 19:00 and tan every half hour until 21:30, was supposed to be more exciting with additional flashing lights.
If you’re a fan of Gundam then this would be a must see. It was built to be life size and was a lot larger than the first Gundam statue I saw outside the Siam Paragon Mall in Bangkok. After viewing, one can also go inside the Diver City Plaza and shop at the Gundam Base store at the top.