Two hours. Baidu map shows that the distance from Zhujiajian Island Island to Dongji Island is 55.0 kilometers, and it takes 2 hours by boat. You can take photos on the deck on the way, which is generally good. Zhujiajian Island Island is a national scenic spot, located in the southeast of Zhoushan Islands, Zhejiang Province. It is also called Putuo Mountain National Key Scenic Area, with a distance of 1.35 nautical miles.