How much time should I spend at Peradeniya Royal Botanical Gardens?

One hour is barely enough to see the entrance. You really need at least two to three hours to properly enjoy the gardens. The Orchid House alone is a highlight, and the Avenue of Palms is perfect for a long walk. Don not miss the giant Javan fig tree which covers an enormous area. It is a very peaceful escape from the noise of Kandy city center.