We went to the science centre during our stay in Singapore last weekend. We allocated three hours for the centre but in the end it was 4 hours. Still, we'd only covered 50% of the place. One whole day should be enough.
It's a good place for children to learn many things, from chemistry, to biology and physics, all the way to IT and many others. I was fascinated too.
One thing i regretted, for not allocating any time for shopping spree in our schedule. Anyway, next trip then, if there's one. It's Christmas season, and I have a long list of things to buy and gifts to purchase.... (I shop gifts for CHILDREN only ya).