Is half a day enough time to take a boat tour and visit the dam?

It’s definitely not enough. It takes about 12:30 to sail to the Three Gorges Dam from 8:30 in the morning; it takes another half day to visit the Three Gorges Dam after dinner. The fastest time to return to the pier is 6pm.
It’s definitely not enough. It takes about 12:30 to sail to the Three Gorges Dam from 8:30 in the morning; it takes another half day to visit the Three Gorges Dam after dinner. The fastest time to return to the pier is 6pm.